... failure, preventing burn out 3. 50-400GPD Household RO 75GPD water purifierTreatment: 5 stage filter. PP Filter: pure PP Filter hardly ... : be made of polypropylene, salt rejection ratio≥98%, the higher water inflow pressure, the higher membrane salt rejection ratio, the better ... failure, preventing burn out. Working Pressure:0.4--0.7Mpa;Water Purification Rate:7-8L/H. Pressure Tank:3.2G/4 ...