For some time I have been using an AquaRain water filter and have found it to be quite satisfactory. It is an attractive stainless steel unit that is easy to clean and will not harbor bacteria like some porous plastics.
It is approximately (assembled) 22 inches tall and 10 inches in diameter. Its approximate shipping weight is 8-9 pounds, including filter elements.
It is available in two models: the 200 which uses 2 elements and holds 1 1/2 gallons of water and the 400 which uses 4 elements and holds 3 gallons of water. Its price is comparable to other similar units on the market.
I have the AquaRain model 400 which is a double-decker gravity flow water filter that consists of an upper and lower chamber, a lid and four ceramic filters. Simply pour the water into the top chamber and allow the water time to be filtered. In a short period of time, the bottom chamber will fill with pure water, to use simply flip the handle on the tap. One thing that I particularly like about it is that the filter comes with an end of life gauge that tells you when it no longer can be cleaned.
As to how effective the filter is the following statement is made by AquaRain.
“The AquaRain® system filters water in a very natural way using gravity to gently draw water down through our “cultured” ceramic stone in much the same manner as nature processes ground water through the earth. The microfine pore structure of our ceramic media will remove dangerous organisms such as protozoan cysts (Cryptosporidium, Giardia lamblia) and microscopic bacteria (E. coli, Salmonella typhimurium, etc…). Enclosed within the hard ceramic shell we have incorporated a concentrated bed of Granulated Activated Carbon (GAC) that contains a self-sterilizing metallic silver. The high performance silvered GAC bed will adsorb various organic chemicals such as MTBE and pesticides, remove chlorine compounds including carcinogenic halogens, and improve the taste and odor of the water. To the benefit of good health, our system will also leave unchanged the naturally occurring electrolytes and minerals found in your water.”
“Our unique ceramic structure has been successfully tested in independent laboratories with Cryptosporidium parvum for cyst removal, and the EPA mandated Klebsiella terrigena for bacterial removal. These elements have also been successfully tested against the Health Industry Manufacturing Association’s test organism, Brevundimonas diminuta, which is approximately one-third the size of the EPA bacteria test organism. It is notable that all of these tests were performed at 60-90 p.s.i. which is far above the very low ½ p.s.i. found in our gravity operated system. This equates to an expected performance in microorganism removal far beyond the results already achieved in our laboratory testing.”
“What is particularly noteworthy is that all of the above laboratory tests have been performed with fully expended elements, ready for disposal. All components for testing were abraded to 10% below their end-of-life tolerance and then exposed to contaminated field water prior to being challenged in laboratory testing. In every case, AquaRain Ceramic Elements surpassed the stringent EPA standards for a bacteria and cyst purifier.”
I have been using mine for some time and have no reason to doubt its effectiveness.