The TRIPLEX water filter combines three different filter cartridges in one housing. Washable prefilter, the polypropylene cartridge holds back undissolved matter. The fine filter prevents the ingress of particulates, for example rust particles, strands of hemp and grains of sand and thus reduces the probability of corrosion. Activated Carbon cartridge filters out fine particles, eliminates of unpleasant odors and flavours caused by chlorine or other organic substances, removes of pesticides, insecticides, chlorinate solvents. The filters ensure a continuous supply of filtered water. The filters can be applied to rain water treatment within the range of their specifications.