[2019] Discover the QUIETEST Aquarium Filter: Loudness Reviews

Aquarium filtration may turn out noisy if you’re not familiar with the right equipment. A silent external fish tank filter does exist and, in fact, there’s more than one. What about internal filters? Are they worth it? By the way, can you make an old aquarium filter quieter on your own? Is your current one really to be thrown away just because it’s too loud?

Quick overview chart of the quietest aquarium filters out there

A quick comparison table of the models being reviewed in this article:

Filter Model: Noise Produced: Additional Tech Features: Price Bracket: Water Turnover in Gallons / Liters:
1. Eheim Classic 22(xx) Series + $$ 60 to 264 gal / 227 to 1000 liters
2. MarineLand Penguin (xxx) Power Filter + + $ 150 to 350 gal / 567 to 1325 liters
3. Fluval (X)06 Series External Filter +++ $$$ 145 to 383 gal / 550 to 1450 liters
4. Aqua Clear Power Filters (110 V) ++ + $ 80 to 500 gal / 300 to 1890 liters
5. SunSun HW-(xxx) Series External Canister Filters ++ $$ 264 to 525 gal / 1000 to 1990 liters
6. Aqueon QuietFlow LED PRO + +++ $ 100 to 400 gal / 380 to 1515 liters
7. Penn Plax Cascade (xxxx) Series +++ $$ 115 to 350 gal / 435 to 1325 liters

What’s the quietest type of aquarium filter?

There are a couple of different types of aquarium filters. They differ in the way they’re implementing the filtering technology. Here’s a list:

  • Sponge filters
  • HOB (Hang On the Back) filters
  • Canister filters
  • Internal filters

And here’s which type is the quietest:

Canister filters are hands-down the most silently-operating water filtration units for aquariums out there. Their architecture and the particular way of turning water via tubing allows them to remain absolutely soundless, while still performing the best in terms of water turnover.

Let me explain.

Sponge filters:

A sponge filter is air-pump powered. It will create air bubbles that will quickly find their way to the water surface. This creates a bubbling noise.

I find that type of noise quite tranquilizing, but I can’t say it’s quiet.

These filters are usually used as secondary filtration for smaller tanks. The main reasons fishkeepers would get them is because of the extra oxygenation (as they move the water surface) and their potential to house beneficial bacteria.

Hang-on-back external filters:

A HOB filter’s motor will run very quiet indeed. However, the way they return water in your fish tank can be noisy.

They literally hang on the wall of your aquarium, creating a waterfall effect.

Usually, you can keep the noise down by maintaining the water level to a reasonable height.

Many aquarists are not as diligent though. One needs to top off the water every 3 to 4 days, to avoid the splashing sound effect.

Most nowadays HOBs have slightly modified outlets that make the water “slide in” the tank rather than fall.

Still, evaporation eventually comes into play and you still find yourself enjoying the blessing sounds of the Niagara Falls.

I personally am a big fan of white noise, and if you’re like me you’d probably appreciate a HOB filter.

However, if you have a roommate who’s a light sleeper, or the aquarium is situated in your children’s room I would not recommend this type of filter unless you’re willing to stay on top of the maintenance.

For diligent people only!

Internal filters:

Internal filters do actually perform well when it comes to noise.

But that’s about it.

It’s just that I would never recommend any of these filters to anyone.

They are air-powered (same as sponge filters), which makes them weaker. They break often and do not provide a filtration powerful enough.

Don’t compromise with your filtration, people!

These filters are not a good long-term investment, as you’d find yourself paying for a new one over and over again.

These filters only work for a smaller tank with very few fish in it. Like a small school of danios or some other dwarf fish.

If this is the case for you, you can look around in Amazon for the Aqueon Quietflow Internal Filter.

Quiet but not good for a community tank.

External canister filters:

Canister filters crush the competition when it comes to soundproof filtration.

This is because they operate in a specially designed cartridge outside of the aquarium.

They are water-powered, which contributes to less internal noise.

Also, there’s tubing.

You won’t hear water splashing, because the water is being returned via a tube. This way they still move water surface (providing oxygenation) while avoiding the crashing waterfall effect.

Most newer models have sound-dampening technology implemented to reduce the noise even more.

No vibration and no humming noises.

My experience has been that canister filters provide both the quietest and most powerful filtration.

Which is the quietest fish tank filter model?

The aquarium filter manufacturers would usually rate the loudness of their product in decibels and announce that on the box. However, these are never realistic, so I wanted to speak from my personal experience here. Here are the aquarium filters that are currently the quietest:

1. Eheim Classic Canister Filter Series

Click here to see the current price on Amazon.

It has been my experience that the Eheim is currently manufacturing the quietest aquarium filters on the market.

A long time ago, when I first installed my Eheim 2211 I actually had to double check if it worked.

Reason being it got completely silent after the initial priming.

The only way I could tell it was working was by placing my hand on it.

A slight vibration would indicate that the motor is pumping. This vibration could only be felt though, no humming sounds whatsoever.

This was a complete shock to me because back then I was really used to a background noise from aquarium filters, at the least.

It was then when I converted to canister filters for life.

I already knew these types of filters have a superior filtration and durability.

However, I did not expect a complete lack of noise.

This filter is no longer mine, it now runs at a friend’s house, because I moved to larger aquariums.

The models for a bigger fish tank would be the Eheim 2215 and 2217.

I used the 2211 model on my 20-gallon tank, and I will give you my personal recommendations for every tank size and setup, but more on that below.

Anyway, that happened many years ago.

When you buy an Eheim canister filter you just know that it will serve you for years to come.

These models are not new – the brand successfully sells them for the past 20 years, unchanged.

You know why?

Because they work and have been working for years.

Whatever model of Eheim canister filter you decide on, be sure that it will last.

I now run the stronger Eheim models at home and they still are virtually silent.

I am not really sure how they managed to pull that one off, as it’s water movement we’re talking here.

This includes motors, impellers and other moving parts, so it’s kind of a mystery to me.

I do run other brands of canister filters too (as they all have their pros and cons for a certain setup) but when it comes being quiet nothing beats my Eheims.

Note: Don’t get me wrong – ANY canister filter is designed to operate quietly and they do, compared to other types of filters. It’s just that the Eheim is the quietest among the quiet ones.

I know the subject here is loudness, but these filters are among my personal choices for the best filter overall.

Extremely reliable and easy to maintain.

You only need to clean the stuff every 2 to 3 months.

The tubing has valves on both ends, which makes the need to transport the unit upon cleaning to your bathroom unnecessary.

A con I would like to mention is the instructions. Pretty crappy instructions from such a giant in the industry.

Still, you can simply watch a video on Youtube on how the set up the thing. There are a plethora of those.

Below in this article, you can find a link to my full review of this product (not only concerning loudness).

2. MarineLand Penguin (xxx) Power Filter

Click here to see the current price on Amazon.

…Where “(xxx)” stands for either 100, 150, 200 or 350.

I am listing this along with two more HOB filters here for two reasons: affordability and proper way of use.

In general hangback filters are inexpensive compared to a canister.

In a canister, you pay for stronger filtration, durability, and silence.

Still, HOBs should not be underestimated as they are perfect for smaller tanks that are not overstocked (though we all end up overstocking at some point…).

By approaching the maintenance properly you will still end up with a quiet fish tank filtration.

This filter’s motor is as silent as a canister’s one.

No, really, it is.

Your only concern in terms of loudness would be the sound of splashing water.

Some people are bugged by the humming noises and others by the splashing.

In my observations, the MarineLand Penguin has no humming noise whatsoever.

And I could easily overcome the splashing.

The only thing I’d need to do is regularly top off the water in the aquarium. This would occur every 3 to 4 days, depending on the season. In the summer the water would evaporate faster.

When topping off, I was making sure the surface reached the outlet of the filter. This way the incoming water was perfectly connected to the surface, eliminating any bubbling noises.

Whenever the water was at a reasonable level, the filter would run completely silent.

It’s a powerful filter and it could handle my 30-gallon community tank.

I think it was stocked at around 70% from what I can remember.

I now run such one filter (the 350) as a secondary filtration on my 55-gallon predatory tank, where I house my smaller Oscars. Very messy fish, if you’re familiar with them.

Anyway, when installing this filter, make sure it does not touch the wall of your room. This will make the vibrations noticeable and you will be able to hear them.

Other than that the MarineLand brand is an authority in the HOB industry.

And that was proclaimed by us, the users.

If you decide on this filter, know that the maintenance will be a breeze.

Easy to clean and easy to change the media.

It’s a pretty good deal for the price tag that comes with it.

Opt for a filter that will turn the water in your tank at least 8 to 10 times per hour. This means that if you want to reasonably stock a 30-gallon fish tank, you should probably get the MarineLand Penguin 350.

Do the calculations for smaller tanks.

Note that with canister filters this estimated number is lower.

These filters come with numerous filter media trays.

The 350 comes with 4.

You can essentially experiment with whatever pads you want.

As for loudness, this filter is perfect if you’re on a tighter budget and you’re willing to maintain a constant water level in the aquarium.

3. Fuval (x)06 External Canister Filters

Click here to see the current price on Amazon.

In my heart, Fluval is the brand that fights Eheim to win me over on the best possible aquarium filtration overall.

Loudness included.

In my personal experience, the Fluval 06 series are the second-best performer in terms of quietness.

These units have their own patented technology for sound-dampening the motor.

They are, again, virtually silent.

Why did I place them second?

Because you can hear them work if you stick your head inside the aquarium stand where you house them.

Considering your head won’t spend much time there, I would say these filters are a pretty decent choice for light sleepers or people who are easily irritated by background noises.

If you find yourself browsing Youtube reviews of this filter just to hear the sound it makes, stop right there!

Did you notice something in common between all these videos? That’s right, these are all made right after the filter has been set up.

A canister filter will be louder right after the installation.

This is because of the small air bubbles inside. Priming is what this is about – extracting air from the cartridge.

However, a small portion of microscopic bubbles remains, before the filter establishes itself.

I am taking the liberty of coining the term “remanent priming” here.

The remanent priming will take care of the air in the next couple of days (3 to 4) after the installation.

It’s a natural process and it will happen on its own.

But at this point, the filter will be slightly louder.

Some canister filters are faster in the remanent priming than others.

The Fluval 06 is, again, the second best here. Why would you go for a Fluval you may ask?

Well, because it’s still ultra silent overall and because of your… tank size.

The Fluval 106, 206, 306 and 406 all offer more GPH (gallons per hour) than the aforementioned Eheim models.

If you’re planning to set up a 55-gallon tank with, I’m assuming, lots of waste producers such as cichlids or other carnivorous medium-sized fish, you need plenty of filtration.

Going with the 306 or (preferably) the 406 here would be wise. But more on my tank-size filter recommendations below.

With its sound-dampening feature and the soundproof cartridge, the Fluval 06 is a top choice for a quiet filtration of heavily stocked middle-sized aquariums.

It is very durable and it will probably last for 5 or more years.

My 306 is currently hitting 7 and it still runs like a champ.

Here you have the added benefit of huge media trays for your filter media of choice.

It is also equipped with Aquastop valves that, eliminate leaking during maintenance.

Oh, by the way, the maintenance is easy as well. The instructions for disassembly are written all over the cartridge.

4. Aqua Clear Power Filters (110 V)

Click here to see the current price on Amazon.

This is the second HOB filter I will include in this list.

The AquaClear is a really strong power filter for the money.

In terms of noise, however, I would place this unit second to last in the list. The reason for my evaluation is that there is, in fact, a low humming noise coming off this filter.

Still, there are way louder HOB filters out there, and this one I can safely qualify as rather quiet. I wouldn’t include it in this list otherwise, but please read further.

As I mentioned earlier I’m a big fan of white noise.

When I travel I play sounds of fans or rain on Youtube to myself before I go to sleep.

I know this sounds kind of radical, so hear me out:

This filter is perfect for someone who doesn’t mind a low background noise, that can only be heard when nothing else is running.

If you are not that person, I suggest you skip this product and select another one from the list.

The humming is really unobtrusive and quickly melts away in other background noises.

This product is among the top-selling aquarium filters on Amazon at the time of writing though, so keep that in mind.

It has a tremendous water turnover potential for a HOB filter and the brand is pretty reliable.

The AquaClear is a go-to choice for experienced and beginner aquarists.

It can do wonders for small to medium-sized tanks that are not overstocked.

The maintenance is nothing to be worried about, it’s pretty easy to clean.

The media trays are large enough.

The filter comes with 2 years of warranty, which means the manufacturers are confident in its work. It is not uncommon for this product to outlive the warranty by a double.

So there’s that.

The rule about maintaining the water level applies here as with any HOB filter.

The lower the water surface, the louder the bubbling noise.

Top off your fish tank regularly and you won’t have an issue with that. Every 3 or 4 days is completely fine, but it will depend on the room temperature.

Considering the quiet humming noise, this filter is not perfect if your tank is situated in your guest room. If you happen to be indifferent to white noise, other people may not be.

I would not suggest to use it if the aquarium is in your child’s bedroom as well.

If you have a baby, however, this filter might be your salvation. Babies love low humming noises.

The thing about the background noise of this filter is that it is constant. No fluctuations to cause a stressful experience.

If you’re okay with that (as I am), and your fish tank setup allows it – get this filter.

A con I would like to mention is that these filters will eventually need a new impeller.

When this happens you will hear rattling. Not something to really worry about, these filters are very affordable and so are their parts.

5. SunSun HW-(xxx) External Canister Filters

Click here to see the current price on Amazon.

If you ever bothered to search for this filter’s noise levels on Youtube, you’d probably be disappointed.

However, in my personal experience, this is not the case.

If you click the link I just provided you’d hear a slight hum, compared to my number one selection (the Eheim).

Go through the comments though.

They all confirm what I’ve experienced – these filters are dead silent.

Truth is that most people who would do a video on the noise, are probably having an issue. And in this guy’s case I’m pretty darn sure there’s something wrong with the filter, that’s probably human error. Like the remanent priming not being over, or there’s some sand or other debris that are yet to pass through the system.

The SunSun canister filters come from China and are fairly cheap for the filtration power they provide.

They have really strong motors and can pump lots of water. Needless to say, I was obligated to buy one, as a self-respecting hobbyist.

I’m glad that I did.

The huge added kit value aside, these filters do excellent filtration, while running absolutely stealthy.

After the initial priming is done there was a slight humming background noise. But as soon as I closed the doors of the cabinet where I kept the filter it was gone.

Fast forward 2 or 3 days in, the filter became completely silent.

From all of the units on this list, I’d rank this filter right along the Fluval 06, sharing the second place. But that’s only upon proper use and after the remanent priming has taken place.

Remember that all canister filters have this period when you first plug them in.

Having said that let’s discuss the filter itself.

This is probably the only device on this list with such added kit value.

By that, I mean that in the box you’ll also get 6 filter pads, active carbon media, 2 different types of bio-media and a UV sterilizer. Holy smokes!

Now, look the filter up on Amazon and check the price.

Can you believe that?

These filters are great for people on a budget. In terms of price to value they’re really killing it.

However there are cons, and I would like to mention those as well:

Well…it’s Chinese equipment.

Nothing wrong with that, just don’t expect this filter to outlive an Eheim or a Fluval.

These are not a years-to-come solution for your aquarium filtration. The warranty is rather short (a couple of months).

With proper maintenance, I’ve had mine live for about 2.5 years, which is quite alright for a filter of this price.

Also, note that the promise of turning over 500 gallons of water per hour is not realistic.

Don’t get me wrong, it’s really going strong and it can cap at around 300 with less livestock. Which is more than enough for me to run a SunSun as additional filtration to 2 of my larger tanks.

Bear with me, later in this article, I will point you out to which canister filter is the best for your tank’s size.

Another thing I would consider more or less a con is the instructions.

Pretty crappy English translations, but the internet is full of guidance on how to properly set up the stuff.

Still, a very silent canister filter that should not be overlooked. If you’re concerned about sound and have a tighter budget – consider getting this, please.

I recommend.

6. Aqueon QuietFlow LED PRO

Click here to see the current price on Amazon.

Don’t mistake this filter for its internal counterpart the “QuietFlow E”.

I am sticking to my words and I’ll only recommend external HOBs or canisters that are actually worth having.

These units come in 5 different sizes as follows: 100, 125, 200, 250 and 400 GPH.

Naturally, the higher you go the larger the aquarium you’d want to filter.

For a decent filtration, you should seek around 10 times of water turnover for your tank.

But more on that below in this article. Now, let’s talk loudness.

From my experience, you should only get this filter if you have a smaller tank, nothing above 20 gallons.

Why?

The more powerful the units get – the louder they become.

If you get the 400 GPH version and are irritated by humming noises, you better have your aquarium in your basement.

Don’t get discouraged though.

This filter is a decent option for a 10 to 20-gallon fish tank.

The smaller units pump lots of water while being quite affordable and very quiet.

The motor of this filter should be submerged which does dampen down the sound.

Again, being consistent with the water top offs is a must if you hate the sound of crashing water.

I think the smaller Aqueon units have a quieter motor than their AquaClear counterparts if I was to compare motor loudness alone.

Perhaps, there’s a reason to include that in the model’s name?

Still, going for a stronger Aqueon may not be a good idea if you’re a light sleeper.

Actually, that applies universally to every fish tank. If you have a larger one and want it to be as quiet as possible, you should absolutely aim for a canister filter. But if you’re newer to the hobby and want to filter, say, a small bowfront fish tank without breaking the bank – purchase an Aqueon QuietFlow LED PRO and be done with it.

Top off the water in the tank every 3 to 4 days and enjoy the silence of these.

For a 10 gallon tank, I suggest that you get the Aqueon 20 (the one that’s rated for up to 30 gallons). Reason being that employing media and the fish stock will lower the final flow rate of the unit.

Don’t forget that it’s still a HOB filter and a canister one would work dead silent compared to those.

Still, in my opinion, this is the quietest external power filter out there, so long as you adhere to the rules I mentioned above.

7. Penn Plax Cascade (xxxx) Series

Click here to see the current price on Amazon.

The Penn Plax Cascade is another canister filter that really impressed me with its lack of operating sound.

They’re the top-selling aquarium canister filters on Amazon, for a reason.

I currently run two of those on my larger tanks, both being the 1500 Series.

They run completely stealthy.

If this is their most powerful unit and it runs like that, you can’t imagine how quiet the smaller ones are.

Mine do give off a low hum when I stick my face inches away from the cartridges though. But with a closed cabinet, I can’t hear a thing.

It’s probably worth noting that I’ve read of people complaining about these being loud.

I do not have such an issue, so I’m assuming those are caused by human error. Or remanent priming.

As with all canisters on this list, I can confirm that the Penn Plax is a nice fit for an aquarium that’s in a bedroom.

I do not keep mine in the bedroom as I have a separate room for my aquariums, but long ago I used to.

However, discovering that this brand of canister filters is silent was by accident.

It had nothing to do with my initial purchase.

I actually got my first Cascade, because of the promising reviews and the huge filtration potential.

The Cascades come at a reasonable price for a canister filter, while being an authority on the market.

I could guess that the silent motor has something to do with that, but I’m sure it’s not the only factor.

These units are super customizable.

They move a lot of water and do come across as strong.

Still, the adjustable flow rate feature is something that I value when I’m choosing filters for my tanks.

Another customizable feature would be the valves. They rotate at 360 degrees. This provides plenty of flexibility when it comes to positioning the unit.

These filters are well-suited for larger aquariums with long finned fish in it.

The kit comes with a spray bar, which I think is a must on a canister. The spray bar breaks down the stream, lowering the return pipe pressure. This way your fish won’t get blown around in the aquarium.

The Cascade series of Penn Plax are advertised to pump up to 350 gallons per hour. The 1500 one can absolutely handle a medium to highly-stocked 55-gallon tank with predatory fish in it.

Even cichlids.

If you plan on intentional overstocking, I will suggest more suitable options, but more on that below.

If this filter starts to make a noise of some sort – it probably has air trapped inside.

Good thing these have their own self-priming buttons installed.

Push it a couple of times (note that it needs a strong push) and be done with the noise.

I think it should be mentioned that during the remanent priming these are louder than the other models listed here. So don’t panic if the filter’s humming at first. It will pass in a matter of hours.

If you’re worried about your first night of sleep after the installation – install the unit early morning. This way by the time the evening comes, it should’ve primed itself fully.

An excellent filter, that pumps thousands of gallons per day in complete silence.

I am really happy with mine, so I can wholeheartedly recommend.

Which one should you pick for your tank’s size?

There are tons of possible aquarium setups, and you should really take into account yours when picking a filter. I’d need to write a whole separate article to realistically cover all of them. Well, in fact, I did:

Since silence is what we’re after here, the article is about canister filters only, with them being the quietest type of filter out there.

It took me quite some time to put it together, so please do check my canister filter guide on aquarium sizes. Click the link to find your info. You can also read my full reviews on all the canister models that I’ve listed here.

When you enter the page you’ll first see a quick navigation table there. Find your desired aquarium size in it and click on its respective link. This will scroll down the article to exactly where I discuss all possible setups for this tank’s dimensions. I’ve listed all the sizes – from 10 to 125+ gallon fish tanks.

Since there’s nothing on HOB filters there I would like to give you a quick recommendation here:

With HOBs you aim at having your water turned at least 10 times per hour. With canisters you want that to be 6 to 8 times, depending on your livestock. When picking your filter consider these:

  • Carnivorous fish make a lot more mess
  • Goldfish are the equivalent of pigs in the fishkeeping world
  • Long-finned fish such as Bettas can get exhausted from swimming in a stronger filter current
  • If you plan to intentionally overstock your tank, go for the highest water turnover possible
  • Fry (baby fish) may get sucked in a stronger filter, so have a separate tank for those prepared
  • Stages of filtration and the space for filter media

How to silence a fish tank filter that’s already running?

If you already have a filter that is being too loud, you should try everything you can before buying a new one, right? Here’s a list of things that can quiet a noisy fish tank filter:

  1. Remove the ceramic and bio balls media – In filters with stronger pumps, the vibration noise could easily be multiplied by ceramic bio-balls. This is something I discovered on my own. Not really proud, but it’s worth mentioning!
  2. Use filter floss – aside from polishing your water crystal clear, filter floss can also reduce the inside noise of your filter. I wrote an article on where to get tons of it for really cheap and why you should use it.
  3. Top off the water level consistently – If it’s a HOB filter you’re having you might be familiar with the waterfall bubbling noise. To achieve a silent aquarium overflow, just top off the water that has been evaporating. The closer the water surface is to the filter outlet, the less splashing there will be. This will effectively put an end to your fish tank filter’s noisy bubbles. If it’s a turtle tank that you’re having, have a look at this video
  4. Wait out the remanent priming – Did you recently install your filter? Is it a canister filter? If this is the case then there might be some remanent priming going on. After the initial priming, some microscopic air bubbles might still remain inside of your filter. Worry not – the device will sort that on its own. Just give it some more time. Manually joggle the unit if needed.
  5. Remove gunk trapped inside – though kind of obvious when it comes to noise reduction, it’s mandatory to mention this. If there’s gunk or sand trapped on the inside of your filter it may be the cause behind the rattling.
  6. Apply vaseline to the impeller – an old trick that you should definitely try before rushing to the store for a new unit. Use a cotton swab and apply liberal amounts on the impeller of your filter. There are tons of videos online on how to disassemble one if you’re worried you’re not handy enough.
  7. Replace the faulty part – well, all things break eventually. You should at least manually inspect the insides of your filter before throwing it away. An unnatural grinding noise is usually caused by a faulty motor or impeller. After you identify the faulty piece, look up its replacement and see if it’s worth the hassle. Usually, the parts can be found cheaper online, if you’re willing to wait for the delivery. If you have friends who are also fishkeepers, there may be a good chance that they’ll have what you need, so ask around.
  8. Clean the pipes and tubing – sometimes debris may partially clog your tubing, which leads to a louder hum in stronger aquarium filters. Use hot water to rinse the insides. Don’t forget to run some dechlorinated water through them after the cleaning.

The sound conclusion

Choosing the most quiet aquarium filter can be challenging without a helpful review from a fellow fishkeeper.

I did my best to outline what I like and dislike about all the units that I’ve included on my list.

My top choice remains the Eheim Classic canister filter. I would personally rate them best when it comes to being silent.

Share with me your thoughts and experiences in the comments and I’ll get back to you as soon as I see them.

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twin

i just bought the sunsun, and sorry, it is far far from being quiet. i got the 303b, and i can hear the hum accross the room.

ELyse
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ELyse

How do you deal with sand grinding in filters? I like the look of aquarium sand and my goldfish like sifting through it, but small particles keep getting into my Aquaclear 110. It rattles and grinds so loud that I can hear it anywhere in the house. My family often has to unplug it to enjoy watching movies (it’s in the same room as the TV). It must be the sand, because I tried the vaseline trick and eventually replaced the impeller, but neither made much difference. I added a cylinder intake sponge. Sand can still come up the bottom,… Read more »