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Re: Tap Water Purifier

With all the discussion about the tap water purifier, one question has not 
been answered. What is the actual capacity/lifetime of a filter cartridge in 
this thing? They state 50-150 gallon capacity in Pets Warehouse catalog. If 
in practice it only provides about 50 gallons deionized water, I'm better off 
going to  Kmart and picking up a gallon of distilled water for $.49 to mix up 
with my tap water for desired kh and gh.