These are replacement sponge/foam blocks and inserts for various filter types. To browse by your brand/model of filter, check our Shop by Brand section. We carry stand-alone sponge filters too.

Sponge provides both mechanical and biological filtration - it removes particulate matter and detritus from your water, and provides surface area for bacteria to populate and detoxify your water of ammonia, nitrites and nitrates. If you've got a sponge as your primary biological filter, make sure you have a separate mechanical prefilter (another sponge can work) so that your bacteria bed doesn't clog up quickly.



Aqua Clear 20 (Old Mini) Foam Block 1pk $1.01	Aqua Clear 30 (Old 150) Foam Block 1pk $1.51	Aqua Clear 50 (Old 200) Foam Block 1pk $1.01	Aqua Clear 70 (Old 300) Foam Block 1pk $2.02



Aqua Clear 110 (Old 500) Foam Block 1pk $4.76	Fluval Filter Foam Block 104 2pk $3.54	Fluval Filter Foam Block 204/304 2pk $3.34	Fluval Filter Foam Block 404 2pk $4.05



Fluval Filter Foam Block for FX5 $11.16	Fluval 2 "Plus" Foam Insert 4pk $5.11	Fluval 3 "Plus" Foam Insert 4pk $6.08	Fluval 4 "Plus" Foam Insert 4pk $7.29



Carbon Sponge for Micro Clean 304 Internal $3.04	Foam Insert for Aqua Clear 70 and 300 - 3 pk $5.07	Foam Insert for Aqua Clear 50 and 200 - 3 pk $3.34	Foam Insert for Aqua Clear 30 and 150 - 3 pk $2.53



Foam Insert for Aqua Clear 20 and Mini - 3 pk $2.53	Filter Foam PCML for 160 and 220 Filters - 2 pk $4.05	Filter Foam PCML for 360 Canister Filter $4.87	Round Small Foam - 2 1/2 in. diameter x 7 in. long $6.08



Round Large Foam - 3 in. diameter x 7 in. long $6.08	Square Small Foam - 11 1/2 in. x 4 in. x 2 in. $6.08	Square Large Foam - 13 1/2 in. x 4 in. x 2 1/4 in. $7.10	Bio Floss for 1000 - 6 pk $8.87



Bio Sponge for 1000 - 1 pk $5.80	Bio Floss for Cascade 1200 and 1500 Canister Filters - 6 pk $9.93	Bio Sponge for Cascade 1200 and 1500 Canister Filters - 1 pk $5.37	Filter Foam PCML for 530 Canister Filter - 2 pk $8.11



Sump Prefilter Sponge Block - 3 in. x 4 in. x 12 in. $8.11	Sump Prefilter Sponge Block - 3 in. x 4 in. x 18 in. $9.07	Prefilter Sponge - 3 in. Diameter x 6 in. $8.70	Marineland Sponge for all Bio Wheel Pros & 660R $4.49



H.O.T. Magnum Foam Sleeve 1 pk $2.02	Marineland Filter Sleeve 3 pk $6.61	Med Mech Sponge for Micro Clean 316 Internal $3.18	Filstar Foam 20 (2 pk) $4.56



Filstar Foam 30 (2 pk) $4.76	Fluval U1 Foam Pad $1.31	Fluval U2 Foam Pad $1.51	Fluval U3 Foam Pad $1.61



Fluval U4 Foam Pad $2.73	511 Mechanical Filter Sponge - Coarse Wedge - 1 pk $4.49	Foam Pad for Fluval Chi - 2 pk $2.02	Fluval Nano Bio-Foam for Fluval EBI - 2 pack $3.04



Fluval Nano Fine Foam for Fluval EBI - 2 pack $2.02