Customer Reviews

Rating: 3.6 of 5 stars 30 Reviews 30 Reviews 3.7 out of 5 Stars

87% Recommend

87% of reviewersrecommend this product

Rating: 3.6 of 5 stars 3.7 / 5

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Penn-Plax Premium Underground Aquarium Filter

Penn-Plax Premium Underground Aquarium Filter

  • Most Helpful Positive Review

    Read All 19 Positive Reviews

    PENN-PLAX UNDERGROUND FILTER

    By NANCY on Oct 10, 2021

    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 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. … more

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  • Most Helpful Critical Review

    Read All 11 Critical Reviews

    Can't buy replacement filters through Chewy.

    By Breezee on Oct 25, 2020

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

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30 Reviews

Showing 1-10 of 30 Reviews

  • 4 out of 5 stars

    PENN-PLAX UNDERGROUND FILTER

    By on

    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.

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  • 5 out of 5 stars

    Penn=Plax underwater gravel filter.

    By on

    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.

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  • 5 out of 5 stars

    Great addition to aquarium

    By on

    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.

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  • 1 out of 5 stars

    Not for me!

    By on

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

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  • 4 out of 5 stars

    Not super sturdy but they work

    By on top1000Contributor

    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.

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  • 3 out of 5 stars

    Can't buy replacement filters through Chewy.

    By on

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

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  • 5 out of 5 stars

    Super Filter

    By on

    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 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. … more

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  • 2 out of 5 stars

    Some parts were broken

    By on

    Nice setup if my plastic tubes wouldn't of been, cracked and broken kinda disappointed but I'm hoping that I can get a replacement

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  • 4 out of 5 stars

    works well

    By on

    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.

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  • 2 out of 5 stars

    ehhhhhhhhhhhhh

    By on

    tbh, this whole order was a mess. i didn’t realize you have to buy MANY more parts in addition to the filter. you have to get a air pump, tubing and a check valve. i spent $20 on top of the filter itself. it’s bubbling really loud and i’m so disappointed. the plastic was extremely hard to break. i wish they would have said you need to order more parts to go with it.

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