Kala-soocida duufaanta ee duritaanka biyaha waa qalab dareere-adag ah oo lagu kala saaro. Waxay isticmaashaa mabda'a duufaanta si ay u kala soocdo adkaha, ay ku jiraan wasakhda, qashinka dhagaxa, jajabyada birta, miisaanka, iyo kiristaalo alaabta, laga bilaabo dareeraha (dareereyaasha, gaaska, ama gaaska-dareeraha isku dhafka ah). Marka lagu daro tignoolajiyada gaarka ah ee SJPEE oo leh noocyo taxane ah oo liner ah (, element filter), kaas oo ka samaysan tignoolajiyada sare ee xidhashada dhoobada u adkaysta (ama loo yaqaan aadka ka-hortagga nabaad-guurka) ama walxaha polymer-ka-xidhashada u adkaysta ama walxaha birta ah. Qalab kala-soocidda walxaha adag ee waxtarka sare leh (waxay hoos u dhigi kartaa 2 microns ee 98%) waxaa loo qaabeyn karaa oo la soo saari karaa iyadoo loo eegayo xaaladaha shaqada ee kala duwan, beeraha kala duwan iyo shuruudaha isticmaalaha.