This pump is designed to be installed before the Stealth RO to boost the inlet pressure. There needs to be at least 40 psi and up to 80 psi of inlet pressure for the Stealth RO to function properly. Wells and low pressure water sources can benefit greatly from this pump. It boosts the pressure significantly, allowing the Stealth RO to run with higher flow and efficiency while having better TDS removal. The pump is designed for long service life and runs very quietly.