Mr Clean autodry while it worked in bringing my 450ppm water to 4ppm non of the filters have lasted more that about 15 gallons. I have found a good alternative is using refillable Culligan jugs from Wally's. They are a little high initially but you can refill for between 25 to 33 cents per gallon (with your smiley face sticker on the lid of course). The water tests to about 9 ppm on my meter.