Pre Filter Sponge

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  • Increases Filter Capacity
  • Prevents Small Fish and Debris from Getting Sucked Up
  • Uses Coarse Foam to Extend Time Between Cleaning

The pre-filter or intake sponge is a simple foam cylinder that is designed to slip over the intake tube of hang-on-back (HOB) and canister filters. The filter intake tube often has large openings that allow sizable objects to get sucked up by the filter, potentially ruining the motor, so use a pre-filter sponge to help prevent baby fish, dwarf shrimp, little snails, plant leaves, fish food, and other debris from entering the filter. (depending on filters suction, and size of animal, tiny fry/shrimp/snails can still get through in some cases)

An intake sponge also provides valuable surface area to grow beneficial bacteria, which purify waste chemicals in the water and make it safe for your fish to live in. Finally, it adds mechanical filtration that extends the life and efficiency of your filter media.

Find out which sponge size to get and how to properly fit it to your hang-on-back or canister filter intake by  viewing the sizing chart and video below. (Click the "Show More" button to expand the Directions/Specifications section.)

Customer Reviews

Based on 2459 reviews
Catherine D. (Tampa, FL, US)
Prefilter sponge

Bought them to replace the ones I have that clog. Very pleased with yours.

Victor L. (San Antonio, TX, US)
Pre filter sponge

Perfect size and coarse so it doesn't restrict flow

Jen G. (Florence, MA, US)
Always happy with Co-op products. Pre Filter Sponges give me peace of mind and extra bb.

No need to worry about small fish being sucked up by my filter with this pre filter sponge. My fish also love eating little bits of great stuff all around this baby. It also provides lots of extra space for beneficial bacteria to colonize so I do not have to worry about losing bacteria when I wipe down my aquarium glass, or change my substrate. This is a great item!

Harley M. (Port Hadlock, WA, US)
Quality product

Seems like a pretty solid product. I failed to read the full demensions in the description, so if you've got a larger inlet pipe, go for the large one

Evelyn L. (Salem, OR, US)
sponge review

I have 10 tanks all having the sponge filter in them. I am very happy how my tanks look soo clean and the fish appear to be happy.