ZYTEST--DI Water Machine ZYTEST Deionized Water System for Hospital Test is usually used for rountine chemical laboratory analysis instruments especially biochemical analyzer. The equipement with simple and generous appearance can easily produce water grade II (0.1-1 us/cm ultra-pure water) and water grade III (2-10 us/cm pure water for glass ware washing) which meets standard ASTM, CAP, NCCLS, GB and T6682-2008.