ConservĀ® Reverse Osmosis System, Conserv LT-S, (1) 4FC5 Pretreatment Carbon Filter, (1) 4CC Post Treatment Calcite Feeder Cartridge, (1) GRO-75EN RO Membrane Cartridge, removes 95% of TDS, & (1) 4 gallon storage tank, 3/8" inlet, 3/8" outlet, NSF 42 & 58, cUL Listed (EV997520)