Free-standing gravity filter with 3 ceramic filters and a 10 litre water container. Effective elimination of all known problem parasites and bacteria without the use of unhealthy chemicals or filter elements that require frequent replacement. Just clean the 0.2 micron ceramic filter elements for up to 20,000 gallons. Popular with missionaries and others living in countries with no plumbing and low or undependable water pressure. Untreated water slowly drips through 2 ceramic elements providing 6 gallons per day. Used by the Red Cross, the armed forces of many nations (including the U.S.), the UN, WHO, and the US Forest Service. Use distillation or ultraviolet if viruses in the water.
The TRK filter consists of two plastic containers stacked over each other. The upper container is filled with up to 2 gallons of untreated water. It is filtered by gravity through three ceramic elements and drips into the bottom container, giving safe, clean drinking water.
Features: - 0.2 micron ceramic depth filter (cleanable) - Capacity (depending on water quality): 40,000 gal or 150'000 liters - Output: about 1 gal/h or 4 l/h - Dimensions: 11 x 18 ''; 25 x 45 cm - Weight: 7.3 lbs; 3.3 kg - Replacement Cartridge Ceradyn: 20743
Available with three ceramic filter elements (Katadyn Drip Ceradyn) or with three combined ceramic & activated carbon filter elements (Katadyn Drip Gravidyn).
Katadyn Ceradyn Ceramic Drip Filter 
Free-standing gravity filter with 3 ceramic filters and a 10 litre water container. Effective elimination of all known problem parasites and bacteria without the use of unhealthy chemicals or filter elements that require frequent replacement. Just clean the 0.2 micron ceramic filter elements for up to 20,000 gallons. Popular with missionaries and others living in countries with no plumbing and low or undependable water pressure. Untreated water slowly drips through 2 ceramic elements providing 6 gallons per day. Used by the Red Cross, the armed forces of many nations (including the U.S.), the UN, WHO, and the US Forest Service. Use distillation or ultraviolet if viruses in the water.