Diatomaceous pasi sefa inoreva sefa yekubikira ine diatomaceous pasi pekuisa sefiltration layer, kunyanya kushandisa mechanical sieving chiito chekugadzirisa nzira yekuchenesa mvura ine zvinhu zvidiki zvakamiswa. Diatomaceous pasi masefa mazambiringa akasefa uye zvinwiwa zvine kunaka kusingachinji, hazvina chepfu, hazvina zvakaturikwa zvakasimba uye sediments, uye zvakajeka uye zviri pachena. Iyo diatomite sefa ine yakanyanya kusefa kurongeka, inogona kusvika 1-2 microns, inogona kusefa kunze Escherichia coli uye algae, uye turbidity yemvura yakasefa i0.5 kusvika 1 degree. Midziyo inovhara nzvimbo diki, yakaderera kureba kwemidziyo, vhoriyamu inongoenzana ne1/3 yejecha sefa, inogona kuchengetedza yakawanda yekudyara mukuvaka kwehurumende yekamuri yemuchina; Hupenyu hurefu hwesevhisi uye yakakwira corrosion kuramba kwesefa zvinhu.