Northern Pure single stage DI has a pre-loaded, refillable cartridge inside. Comes with a hand held TDS water meter.
Simple plug and play design. Hook up to water tap, exit to waterfed pole and start cleaning. You can purchase 1 cubic ft bag of resin for refilling. (1 cubic ft bag will give you 4 refills) Setting input valve at 'half way on' will prolong resin life.
Ideal for areas with soft water & occasional use. This is not an 'everyday use system' if used in hard water areas. Makes an excellent starter system.