Water filter & purifier?!
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Think they're all designed to do the same sort of job, I bought one a few years ago, it cost me almost $300, but worth every cent. Town water makes me crook, mine is Sunbeam, and takes replacement filters, good luck with your search
For well water with bacteria and to protect against heavy metals, pesticides and other chemicals we recommend a ceramic pre-filter (Doulton brand) followed by a KDF/GAC cartridge. It's a two filter system that can last up to 3 years without changing the cartridges. The ceramic cartridge will filter down to 0.5 microns (bacteria is 0.9 microns and above) and can be cleaned up to 40 times. The KDF/GAC will remove the heavy metals, pesticides and organics, and can last 3 years. This system will leave the healthy minerals and remove 99.99 percent of any bacteria. If there is a lot of sediment, it may need to be cleaned often--once a week--when the water slows down. Countertop and under-counter filters for bacteria and heavy metals, etc, are available from The Water Exchange in Michigan.
water filters at http://www.thewaterexchange.net