West Texas | I use Whirlpool "wher25" and have used it 19 years on this house and 4 years on the house in Midland. Change 2 filters every 6 months, (yes, they do start slowing down) and the main membrane filter every 18 to 24 months. I run the water through a softener before it comes into the house to get rid of the hardness. Personally I cannot taste the difference between the softener water and the RO water but my wife says she can. End of arguement |