... water,3.Using import good quality RO membrane.5 stage reverse osmosis1st stage PPF: Remove suspension of more than 5m dia. ... deleterious substances such as chorine remains, halide, etc.3rd stage Carbon Block: Filters absorbs bad odor and deleterious substances such ... as chorine remains, halide, etc.4th stage RO membrane: Thoroughly remove the bacteria, heavy metal, salt ...