Katadyn TRK Drip Gravidyn Water Filter Review

I purchased the TRK Drip Filter (Gravidyn) as a gift for a relative (for home use) in southeast Asia whose water supply is from a well. The criteria were: ceramic element, compact, plastic or synthetic housing. As I've used Katadyn Combi Filter for backpacking and occasionally at home for 6 years, Katadyn was high on my list. IMO, ceramic elements give the best filtration. The initial cost is high but their value is realized through durability and long life. This unit has been in service since January '06, filtering ~10L/day or a total of ~3,300L (864 gallons) so far. The Activated Carbon (A/C) portion of the filter is effective for 6 months but the ceramic is good for 39,000 gallons (~148,980L). What I like most about this filter: fast flow rate (3 elements), impregnated silver-oxide prevents fungus/mildew growth on/in the element.

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Product Description:
The Katadyn TRK Drip Gravidyn free-standing gravity filter features a 10 liter water container for large quantities of water. It's ideal for the water supply for camps, cabins and homes without running water. This Gravidyn version comes with three combined ceramic and activated carbon filter elements.
Ceramic filters have a micro porous structure with impregnated silver which delays the growth of bacteria. The pore-size of Katadyn ceramic filters is 0.2 micron (0.0002 mm). Bacteria range in size from 0.2 to 5 micron and, like protozoa (1 to 15 micron), are efficiently filtered out. Ceramic filters can be mechanically regenerated and the filter capacity is measurable.
Activated carbon is used for its ability to reduce harmful organic and inorganic substances in the water. It removes unpleasant tastes, odors, chlorine, pesticides (lindane, DDT) and trihalomethanes (THMs). These substances adhere to the large surface area of the activated carbon. Activated carbon granulate cannot be regenerated.
Specifications:

Technology: 0.2 micron ceramic depth filter
Output: ca. 4 liters/hour
Cartridge Capacity: Up to 150'000 l (depending on water quality)
Carbon Capacity: Recommended to change after 6 months
Weight: ca. 3.3 kg
Size: 25 x 45 cm (9.8 x 17.7 inches)

Why Treat Water?
A crystal-clear stream or lake usually contains microorganisms that can make you sick. Water contaminants like protozoa, bacteria and viruses, can cause serious illness. Optimize your travel preparation and use a portable drinking water system from Katadyn.
About Katadyn
Katadyn of Switzerland has been producing high quality portable water systems since 1928. Their history has been one of innovation and durability. Katadyn products are used by militaries, health organizations and outdoor adventurers world-wide. No other water system provides higher quality or longer lasting performance. Katadyn is the global leader in portable water treatment. With subsidiaries in the United States, Germany, France, and Singapore; Katadyn develops, produces and distributes high quality products which are used whenever safe drinking water isn't available--for travel, camping and humanitarian operations.


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