Prevents small animals and debris from entering filter: Protects filter motor and extends filter lifespan
Coarse foam construction: Extends time between cleanings for less frequent maintenance
Provides surface area for beneficial bacteria: Enhances water purification and water quality
Simple installation: Fits most hang-on-back, HOB, and canister filter intakes
Multiple size options: Ensures compatibility with various filter brands and intake sizes
Summarized by Shop
Upgrade Your Filter Intake
Increases Filter Capacity
Prevents Small Fish and Debris from Getting Sucked Up
Uses Coarse Foam to Extend Time Between Cleanings
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
Material
Coarse foam
Available Sizes
Mini (0.5 in diameter x 1.5 in length), Medium (0.5 in diameter x 2.5 in length), Large (1.25 in diameter x 3.5 in length)
Pore Size
Approximately 25 ppi (mini/medium), 20-25 ppi (large)
Compatible Filter Types
Hang-on-back (HOB), canister, and external filters
Cleaning Instructions
Rinse at sink or use fish bag for debris removal
Summarized by Shop
4.9
28 ratings
5
4
3
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1
An useful pre-filtering solution if needed
I
Igor · 1 day ago
The large was a perfect fit on my FX2. It's a nice course size which allows finer matter through but traps larger plant matter. I also got a medium which, in my opinion, is also perfect for my 207. It is recommended to get a large for the 207 but now that I have a large on my FX2 there is no way a large would fit in the tank I have my 207 in. Medium size is perfect.
M
Mike · June 10, 2026
Threw this on a Fluval C4 and it makes a heck of a difference. Lots of surface area on the intake sponge so it won’t plug up your intake plus lots of area for beneficial bacteria. Love it!