We have had our system since 1995 without one single problem. Water difference is amazing. Can't believe the price now!!! We paid $2500.00. The filter for the undersink unit was too expensive, we ended taking the unit out after a year. Didn't really notice any difference anyway. Our system is a salt tank and a carbon unit filter tank and that's it, all set up in the basement where the water supply comes in. Good luck, we love ours. Too bad so much money now.