Mega-Pure deionizers are designed for pretreating feedwater to Mega-Pure stills, or as free standing units. Available in one or two cartridge designs. Both models have automatic temperature compensated purity meters to measure water quality and indicate when cartridge is exhausted. Flow valve precisely controls product flow. For wall or bench mounting. D1 is single cartridge, D2 is dual cartridge. For 110V, 50/60 Hz.