Penn-Plax Premium Underground Aquarium Filter

By Penn-Plax
Rated 3.625 out of 5 stars
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Penn-Plax Premium Underground Aquarium Filter, 10-gal slide 1 of 2
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Penn-Plax Premium Underground Aquarium Filter, 10-gal slide 1 of 2
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$10.29Chewy Price
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$11.99Chewy Price
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$1.70
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Rated 3.625 out of 5 stars
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About This Item

  • Premium filter offers convenient, trouble-free maintenance to make tank-keeping easier.
  • Keeps water crystal clear, so you can spend more time admiring your beautiful, finned friends.
  • Jumbo 1 inch adjustable lift tube allows you to tailor the height to your aquarium’s water level.
  • Includes filter cartridges to keep waste and harmful gases and chemicals out of your habitat.
  • Easy to set up and install, which means you can waste less time putting your tank together and more time enjoying your aquarium.
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Learn More About Penn-Plax From Our Team of Experts

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Fish TypeTropical Freshwater, Marine Fish, Cichlid, GoldfishTropical Freshwater, Betta, Cichlid, GoldfishBetta, Goldfish, Cichlid, Tropical FreshwaterTropical Freshwater, Marine FishTropical Freshwater, Marine Fish
Aquarium TypeFreshwater, SaltwaterFreshwater, SaltwaterFreshwaterFreshwater, SaltwaterFreshwater, Saltwater
MaterialPlasticPlasticPlasticPlasticMesh

Questions & Answers

22 Customer Questions


How does this keep your tank clean when all it does is bubble up the tube and not from underneath the gravel
Answer by ChewyOct 20, 2017
The filter is designed to keep the water in the tank clean by ridding the water of waste and harmful gases and chemicals and leaving the water crystal clear.

Is this good to use for saltwater fish?
Answer by ChewyJul 16, 2017
The Penn-Plax Premium Underground Aquarium Filter is recommended for Freshwater fish.

ware can i get replacement fillters
Answer by ChewyJan 18, 2021
At this time, we do not carry the filters however, the Penn-Plax Filt-a-Carb Carbon Undergravel Filter Cartridges are available directly through the manufacturer.

Can i use this filter in conjunction with canister filter and water circulation pump?
Answer by ChewyJul 10, 2019
This undergravel filter may be used along with a canister filter. Before using, ensure the intake tube is not near anything that is causing air bubbles. The canister filter will pull in the bubbles along with water and air will build up inside the canister.


ReviewsWrite a Review

3.6
Rated 3.625 out of 5 stars
32 Reviews
88%
Would recommend to a friend
1
12.5
13%
2
15.625
16%
3
9.375
9%
4
21.875
22%
5
40.625
41%

32 Customer Reviews



Rated 1 out of 5 stars
By Notgood on Apr 9, 2022

Undergravel filter not the best

This filter is ok, but not as good as my old one. The fish waste sits on top of the gravel; and accumulates on the edges of the tank. I have 6 fish in a 35 gallon tank; so I don't have an overcrowded tank by no means. zebra danios and one Pleco.


Rated 5 out of 5 stars
By fishy on Jan 15, 2022

filters and use

these work great use lift tube on one end connected to canister filter other end a power head or 2 power heads use corner filters for bio and chemipure or canister. i have had a tank that only needs filter maint. and add water for over a year. shoot the flow direction of filter and powerhead at front center of tank to cross flow creating turbulent flow. other than monthly lite vacuming and keeping either the canister retun or powerhead above water at least .5 inch for airation for amonia pretty maint free note use boyds chemipure.


Rated 4 out of 5 stars
By NANCY on Oct 10, 2021

PENN-PLAX UNDERGROUND FILTER

THE ITEM IS A GREAT UNDERGROUND FILTER, BUT, WHEN ARRIVED AND OPENED, THE ONE PIECE THAT THE CHARCOAL FILTER PART SLIDES INTO WAS BROKEN ON THE BOTTOM UPON TAKING OUT OF THE PACKAGE. I HAVE IT CURRENTLY TAPED UP TO BE ABLE TO USE IT AS I HAD THE FILTER ALL SET WITH THE STONES ON TOP IT BEFORE I PUT THOSE LAST PIECES ON.. AND MY GRANDSON WAS NOT HAPPY I HAD TO TAKE HIS TURTLE TANK APART AGAIN.


Rated 5 out of 5 stars
By old409 on Jul 4, 2021

Penn=Plax underwater gravel filter.

I always use an underwater gravel filter along with a sponge filter and a HOB filter. Each type of filter does its thing and my tanks stay clean and clear longer and the nitrogen cycle is kept intact by using more than one filtration system that supports it.


Rated 5 out of 5 stars
By Goldneye on Mar 18, 2021

Great addition to aquarium

Updated my 20 gallon tank and added this ungravel filter. 10+ years ago they were popular and I used one and enjoyed it. Fast forward to this tank now, they were not easily found in store or online. 4+ years now, I updated my tank and found this on Chewy, it made a difference in aesthetics, less tubing but more air flow.


Rated 5 out of 5 stars
By Alyssa on Oct 23, 2020

Super Filter

After lots of online research, some people either love or hate under gravel filters. Personally, I think it’s a great set up for any tank. I liked it because of the lower water flow compared to a power filter. I wanted fish who like less flow: Betta, Guppies, Mollies. I also did an aquatic plant and just planted it in a little terra cotta pot with gravel. This system works by using the air bubbles in the lift tubes to create suction through the base plates under the gravel. When the solids are pulled through the gravel to the base of the tank, beneficial bacteria is able to digest and break it down. I still plan on doing water changes each month and using a gravel vacuum to suck up additional solids. I chose to use a nano air pump with the system because my tank is only 10 gallons and the nano air pump is very quiet. when the solids are pulled through the gravel to the base of the tank, beneficial bacteria is able to digest and break it down. I still plan on doing water changes each month and using a gravel vacuum to suck up additional solids. I chose to use a nano air pump with the system because my tank is only 10 gallons and the nano air pump is very quiet. NOTE: you will need to purchase an air pump and airline tubing separately to complete the set up. I would also recommend a splitter for the air tubing if you’re planning on using one air pump to power the uplift tubes.


Rated 4 out of 5 stars
By Rick on Oct 29, 2020
Top 1000 Contibutor

Not super sturdy but they work

The Penn-Plax Underground filters work just fine. They aren't exactly flimsy but they aren't nearly as sturdy as some other brands so you have to be aware of that when installing them. But they don't cost near as much either. And the plates are completely flat, which some filters aren't. I would not suggest them for use in salt water tanks but they are a good buy and they work.


Rated 3 out of 5 stars
By Breezee on Oct 25, 2020

Can't buy replacement filters through Chewy.

I love the filter. Fits great in my 10-gallon tank was very easy to assemble. BUT Chewy does not sell the replacement filters!


Rated 1 out of 5 stars
By Misslily63113 on Dec 18, 2020

Not for me!

Followed the directions , this is not for me. It doesn't work .


Rated 4 out of 5 stars
By mike on Jul 26, 2020

works well

It took a little bit to plumb the air lines but it wasn't too bad. The product works well. I think you guys need a link to replacement charcoal cartridges. I cannot find those yet. Keep in mind if you buy one of these you will need air valves more tubing and a good air pump. But the system works well and is inexpensive.