Cartridge is disposable, economical, and efficient for processing small amounts of raw water for use in the laboratory. Also used as a pre-treatment to a still to eliminate scaling and improve distillate purity. Cartridge contains ion-exchange resins in a two-bed configuration. Can process larger amounts of deionized water than the Ultrapure cartridge, but results in a little lower purity level of 175,000 ohm-cm. Capacity of resin is 1870 grains of NaCl to an endpoint of 50,000 ohm-cm. Flow rates recommended are 45 liters/hr on raw water, or 90 liters/hr for pretreated water, or cartridges in series.