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 2587 reviews
Lisa H. (Caledonia, MI, US)
Large pre-filter sponge

Shrimp love it. Great protection for babies in the tank. Provides additional biological and mechanical filtration for tank. I love the pre-filter sponges!

Chris W. (Seattle, WA, US)
A must have.

Our hang on back filter would slow and clog very quickly. The flow has been great since adding the pre-filter. The water looks great, with less maintenance.

Larry Y. (Silverton, OR, US)
Great idea

These work great. Im trying the biggest one, hope i like it cant get areply about why easy carbon is gone

Customer (Seattle, WA, US)
Great product

Put this on my new power head.

GERARDO G. (Reynosa, TAM, MX)
Great product, it keeps my filter cleaner, longer.

My filters run cleaner longer, and I have noticed the hang on the back filters last longer without any problems.