Compact system for requirements of less than 15L of pure water per day. Choose portable batch feed system, line feed system, UV line feed system or UF line feed system. Uses feed water pretreated by reverse osmosis, distillation or deionization. Microprocessor controlled purity monitor provides digital resistivity readings, temperature compensated to 25 deg. C. In standby mode, water circulates for 10 minutes every hour to maintain purity. Batch feed model features a 7L polypropylene filtered storage reservoir, low water pump protection and a 0.5L per minute flow rate. Line feed model is fed from a pressurized feed line or a gravity feed storage tank and has up to 1.5L per minute flow rate. Both models produce Type I water with total organic carbon content less than 10 ppb. UV line feed model features dual wavelength ultraviolet light 185 and 254nm to provide water purity of below 3 ppb TOC and up to 18.3 megohm-cm; 0.2 micron filter removes particles and bacteria at outlet. UF line feed model uses a 10K mol wt. ultrafilter to provide less than 0.005EU/ml pyrogen levels and greater than 4 log reduction of pyrogens. All models have cabinet with metal back and molded plastic front and can be either bench or wall mounted. Size: 121/4Wx183/4Dx181/8H inch. Batch feed model uses two cartridges; line feed, UV line feed and UF line feed models require three cartridges. .