... 1: Sediment filter removes suspended impurities from inlet water. rwater purifier,water softener They are 4 stages.Stage 1: Sediment filter ... the growth of bacteria and algae. Stage 3: Activated block carbon cartridge removes organic chemicals, agricultural chemicals, insecticides, bleaching agent, ... , etc.), parasites and microbes up to 99%.(rwater purifier,water softener,water purifying equipment)