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 2576 reviews
Emma A. (Sheboygan, WI, US)
Great quality

Great product, not much more to say. Use it in my stump tank and will continue to.

Chase R. (Franklin, IN, US)
Large Pre-filter Sponge is perfect!

I bought this to use as a sponge filter by attaching to pvc in my outdoor tub for this summer. It works perfectly and will definitely buy more for future tubs.

Lisa Y. (Wenham, MA, US)
Love these in my tank

The sponge helps filter bulky leaves, plant matter from clogging suction portion of my filter system. I have always have a few of these in hand

Andrew (Nassau, NY, US)
It's big

Got the large for my fx2. Works good had to ziptie it to the tube but works

Kenya A. (Poulsbo, WA, US)

Pre Filter Sponge