Multiple insert filtration system yields more media volume than comparable cartridges. Alternating media replacement preserves bacterial colonies to keep your aquarium clean and your fish healthy. Designed to fit your filter perfectly. Foam inserts trap debris and house beneficial bacterial colonies. Carbon inserts absorb harmful liquid wastes and dissolved organics. Amrid inserts remove harmful ammonia from freshwater aquariums. Media bags hold media for additional filtration needs. 2 bags per pack.
