... ,Salmonella,Serratia,E.Coli, Fecal Coliform>99.99% Function Ceramic Filter: Filter out dust, rust, cyst, Cryptosporidium & Giardia, particles and ... by the following independent bodies or agencies:Ceramic Filter Cartridge CleaningUse a small scrubbing sponge to clean off the residue. ... Generally, filter should be washed once every 15 to 30 ...