PVC nembanemba ndi nembanemba zinthu ndi ntchito kuyeretsa madzi. Imatha kuchotsa zonyansa ndi zoipitsa m'madzi, kuphatikiza zolimba zoyimitsidwa, ma macromolecular organic matter ndi ma ion, kudzera pakuwunika kwakuthupi ndi kuwunika kwa maselo, potero kuwongolera ...
Werengani zambiri