Pamwamba pake pamakhala mankhwala apadera oyeretsera/kuwotcha, omwe amaletsa bwino kuti ulusi usagwe ndikuipitsa filtrate, fyuluta yofewa komanso yofanana yamitundu itatu ili ndi mphamvu zambiri zogwira tinthu tolimba ndi colloidal, ndipo ulusi wautali wamphamvu umapangitsa thumba la fyuluta kukhala ndi mphamvu yokhazikika yosefera komanso nthawi yayitali yogwirira ntchito.