sponge filter

A sponge filter is an aquarium filtering device that uses a sponge as the main medium to trap debris and provide a surface for beneficial bacteria. It works by drawing water through the sponge with an air pump or a power filter, removing waste and maintaining water quality. The sponge’s porous structure captures particles and host bacteria that break down harmful substances like ammonia and nitrites, supporting a healthy environment for fish and other aquatic life. Sponge filters are simple, cost-effective, and gentle, making them ideal for delicate fish or breeding tanks.