Heavy metal chochotsa wothandizira CW-15 sipoizoni komanso wochezeka ndi chilengedwe. Mankhwalawa amatha kupanga chitsulo chokhazikika chokhala ndi ma ion achitsulo amphamvu kwambiri komanso osakanikirana m'madzi oipa, monga:Fe2+,Ni2+,Pb2+,Cu2+,Ag+,Zn2+,Cd2+,Hg2+,Ti+ndi Cr3+, kenako nkufika cholinga chochotsa hea. ..
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