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.