The Hydro-Logic Stealth Booster Pump is designed to be installed before the Stealth-RO to boost the inlet pressure. Wells and low pressure (below 40 psi) water sources can benefit greatly from this pump. It boosts the pressure significantly, allowing the Stealth-RO to run with higher flow, more efficiency while having better TDS removal. The pump is designed for long service life and runs very quietly. Comes with a high pressure switch.