Diatom Filters are specialized mechanical filters for removing fine particles from aquarium water.
Diatom Aquarium Filters are specialty filters, designed for extremely fine mechanical filtration, or water polishing. These special filters are not recommended for long-term, every-day use. These filters get their name from the Diatomaceous Earth powder that is used inside. The powder is very fine, and loaded into the filter to create a very small pore size in the filtration system to trap the smallest of particles in the water. Diatom filters are excellent for polishing the aquarium water after cleaning and water changes.