What's Filter foam and biochemical sponge different?

Marineland Filter Foam provides a large surface area for screening out and trapping particulate debris and enhances biological filtration. The filter foam can be rinsed and reused once every 3 weeks for a total of 9 weeks. Remember to replace your filter cartridge once a month or when you see a reduction in water flow. Make sure to change 25 percent of your aquarium water monthly. Fits all Marineland C-Series and Magniflow 160 and 220 Canister Filters. Compatible with Marineland Rite-Size S.

Marineland Filter Foam

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