SD501 KANGEN WATER IONISER Due to its reliability, great quality water and 20 year life expectancy, it is no wonder that the SD501 is Enagic®'s best-selling unit. It produces all 7 pH types of Kangen Water. The SD501 has 7 platinum dipped titanium plates. It has a pH range of 2.5-11.5 with over 100 uses for skin, cooking, cleaning, drinking. Inbox for more info :) Reason for selling, we got a new one.