Ƙa'idar tacewa na kafofin watsa labarai ta tace yawanci ya dogara ne akan tsangwama ta jiki, adsorption, nunawa da karo na rashin aiki.
Tsangwama ta jiki yana nufin cewa ɓangarorin da aka dakatar da su a cikin ruwa suna toshe su ta kofofin watsa labarai masu tacewa kuma suna riƙe su a saman ko cikin kafofin tacewa. Kafofin watsa labarai na tace yawanci suna da takamaiman tsari na pore. Lokacin da ruwa ke gudana ta cikin shingen tacewa, ana katse barbashi masu kyau saboda girmansu ya fi girma.
Adsorption kuma yana taka muhimmiyar rawa a cikin tsarin tacewa. Filayen kafofin watsa labarai na tace yana da takamaiman ƙarfin talla, wanda zai iya haɗawa da wasu ƙwayoyin halitta masu narkewa, colloid da sauran ƙazanta, ta yadda za a kama su tare da kafofin watsa labarai masu tacewa.
Ka'idar nunawa tayi kama da rawar sieve. Tace kafofin watsa labarai daban-daban masu girma dabam suna da pores masu girma dabam daban-daban, waɗanda za su iya duba ɓangarorin masu girma dabam dabam dabam a cikin ruwa, su shiga manyan ƙazanta a cikin babban ɓangaren tacewa, kuma a hankali suna ratsa ƙananan ƙazanta a cikin layin tacewa.
Hatsarin inertial yana nufin lokacin da barbashi da ke cikin ruwa ke gudana suna da wani rashin aiki, idan suka ci karo da pores ko saman kafofin watsa labarai na tacewa, sai su karkata daga inda ruwan ke gudana saboda rashin kuzari, ta haka ne za su tuntubi kafofin watsa labarai masu tacewa ana katse su.
