Undergravel Filter



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Penn Plax Premium Under Gravel Filter System - for 40-55 Gallon...
277 Reviews
Penn Plax Premium Under Gravel Filter System - for 40-55 Gallon...
  • Undergravel filter system includes 4 filter plates (each measuring 11.5" X 11.5") with extra large 1 inch...
  • Filter is suitable for most 40 and 50 gallon aquariums. Clips to hold each section securely together are included.
  • 2 carbon filter cartridges remove odors, and water discoloration by trapping the pollutants in the pores of the...

Are you looking for a reliable undergravel filter for your fish tank?

Do you want a safe and efficient way to clean your aquarium without disturbing your fish?

Do you think undergravel filters would be a great addition to your fish tank but have no idea what the best products are in the market?

If you wish to get an aquarium, you must also plan on keeping it clean. Most aquariums do not have self cleaning mechanism, hence you will need to turn to undergravel filters for this job

Reports indicate that undergravel filters are quite effective in cleaning the water and keeping the fish save. While there are many types of filtration systems available to choose from, undergravel filters for fish tanks are your best bet due to a number of reasons.

Undergravel filters contain a filter plate that lets water flow freely under the gravel, which blocks both small and large particles of waste and dirt. The gravel acts as a biological and mechanical filter, and keeps the water clean and free of any contamination.

There are many undergravel filters out there, but not all are the same. Typically, these types of filters last for years and require no maintenance, except for regularly cleaning the gravel. However, many undergravel filters do not come with a lift tube and air pump, which you might have to buy separately. Moreover, some of these types of filters have carbon cartridges that may affect performance.

No need to delay any further...

5 Great Undergravel Filters For Fish Tanks

Filter #1:

Penn Plax Premium Under Gravel Filter System - for 40-55 Gallon...

The Penn Plax Undergravel Filter is one of the best undergravel filters for fish tanks suitable for a 40-50 gallon fish tank. This product makes it easy for you to clean the water as it is composed of 4 plates that do the cleaning job. The filter mainly performs biological filtration to get rid of dirt particles and that too with no maintenance at all.

Beside dirt particles, fish tanks can sometimes get filled with chemicals and bad odour which can affect the health of the fish inside and also destroy the look of the aquarium. To provide solution to this problem, this product has 2 carbon filters whose job is to clean the chemicals found in the fish tank and keep the fish out of danger.

The Penn Plax Undergravel Filter also has a special option that allows you to adjust the height of the water level by adjusting the 1” jumbo lift tube in the filter.

This product is extremely easy to set up in your aquarium and will give you no trouble. However, you have to buy an air pump for it and a power overhead as well if you wish to increase the amount of oxygen for your fish inside the fish tank.

Remember that this product can break easily, so make sure you are very careful during the installation.


  • Water level can be adjusted via undergravel filter life tube.
  • Doesn’t affect the aesthetics of the fish tank as it hides from the view once covered in gravel.


  • Not very durable.

Filter #2:

uxcell Plastic Fish Tank Undergravel Filter Board Air Pump Hose...

This undergravel filter is made up of 24 assembled pieces and can easily fit in your fish tank. The bottom plates of the undergravel filter can be connected according to the size of the fish tank.

The filter set up is extremely easy and since the plastic cells are nicely crafted into tiny squared shapes, unwanted particles are easily trapped into them and the water is kept clean.

There’s a long tube and an air hose to promote good aeration in the fish tank. Overall, this filter for fish tank is a great product that works like a charm. However, there’s one flaw in it, the filter tube isn’t much durable and might not stretch a lot in case you have a higher level of water in the tank.


  • No maintenance.
  • Easy set up.
  • Cheaper.


  • Undergravel filter tube is not of good quality and also does not stretch much.

Filter #3:

Aquarium Equip Under Gravel Filter 7.8'x5.5' undergravel...

This undergravel filter is suitable for both saltwater and freshwater tanks. There is however a limit for adding the gravel on the undergravel filter which should be around 1 to 2 inches and it also needs to be thoroughly rinsed before being added to the fish tank.

This product is a perfect fit for compact fish tanks where oxygenation can be a problem as the air pump is especially designed to circulate aeration throughout the fish tank.

Moreover, the pipe that accompanies the filter can be easily fitted with any outer filter or submersible filter to have good filtration in the fish tank.

The flaw of this product is that the tube doesn’t fit properly and constantly keeps on moving which can look a bit odd to the viewer.


  • The undergravel filter is perfect for both salt and fresh water.
  • Aids in aeration.


  • Only suitable for fish tanks that are smaller.

Filter #4:

Angels Aquatics & Pet Supplies Hexagon Aquarium Fish Tank Under...

This undergravel filter can work for fish tanks up to 20 gallons. The undergravel filter comes with one uplift tube which is responsible for filtering and clearing out dirt and debris from the fish tank.

There’s also an airline which you will get when you buy this product. The airline is an inch in size and should be connected to the end of the filter plate to stop the water from running back into the air pump.

This is one of the best undergravel filters in fish tanks because it cleans up the toxic wastes efficiently and also helps you get rid of any harmful chemicals that may be present in the water.

However, on the downside, the plastic from which this product is made is very thin and might not support hard gravel substances.


  • Is very stylish and can improve the look of your tank.
  • Is perfect for both big (up to 20 gallons) and small tanks.


  • The uplift tube is only one inch in diameter and might not flush bigger debris particle from the water.
  • Made from very thin quality plastic.

Filter #5:

Lee's 40/55 Premium Undergravel Filter, 12-Inch by 48-Inch

With this undergravel filter you can have convenience and the ability to keep your fish tank highly maintained and free from harmful substances that may contaminate the water and affect the fish.

Just like the system discussed above, this product also has an uplift tube that makes sure that the water is circulated properly and in all corners. The carbon cartridges in the filter clean up the bad chemicals that are formed because of fish waste and also make sure that the water doesn’t not smell.

The plates of this product are extremely durable and resistant to cracking, which is easily one of its best qualities as this system has a good shelf life. Moreover, the durability means you can also easily place elements like rocks and other various equipment without any fear.

However, for a 55 gallon tank, the bottom isn’t completely filled with purified water and can be a bit troublesome.


  • The air diffusers and carbon cartridges are durable and efficient in making the contents crystal clear.


  • The air stones are small and aren’t suitable for bigger tanks.

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Last update on 2020-07-07 at 18:05 Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product. CERTAIN CONTENT THAT APPEARS ON THIS SITE, COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.

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