Hi Mike, I believe you are right; it does cut down the "waster " water significantly. I don't recall the exact numbers, but the Spectra Pure site has them. If water usage is a major concern a pressure tank may pay for itself. erny --------------- See http://www.aka.org/AKA/subkillietalk.html to unsubscribe Join the AKA at http://www.aka.org/AKA/Applic.htm