Filter Cartridge for GF400(Small corner filter)

-Removes odors, discoloration and impurities

-Convenient and ready to use

-3 stage Filtration

Stage 1 Mechanical

High density floss captures debris and particulates

Stage 2 Chemical

Activated carbon removes discoloration, odors and toxins

Stage 3 Biological

Built-in biological grids allow for beneficial bacteria growth to remove ammonia and nitrites.