Mwambiri,Sefa ya Carbon Blockimayamwa mitundu yosiyanasiyana komanso fungo la UDF.Panthawi imodzimodziyo, ikani tinthu tating'ono ta granular activated carbon, ufa wapamwamba kwambiri wa carbon, kupyolera mu njira yapadera yochepetsera kutentha kwa kutentha kwapang'onopang'ono komanso kusefera kwakuya, kumapangitsa kuti fyulutayo ikhale fyuluta yabwino. nthawi yapakati pa madzi ndi mpweya wopangidwa ndi mpweya, imasefa mogwira mtima ma carcinogens monga mitundu yosiyanasiyana, kukoma kosiyana, zitsulo zolemera, ndi trihalomethanes, ndipo imatha kuletsa kwambiri kubereka kwa mabakiteriya ndikuteteza RO.