Upgradable from 2,000 GPD to 19,000 GPD. Liquid filled pressure gauges for pre-filter in and out, concentrate pressure and system pressure. Stainless steel multistage high pressure RO pump with SS pump throttling valve. 5 micron 20 in x 4.5 in cartridge filter & housing sediment pre-filter. System control, recycle control and pump throttle valves.