... failure, preventing burn out 3. 50-400GPD Household RO 75GPD water purifierTreatment: 5 stage filter. PP Filter: pure PP Filter ... made of polypropylene, salt rejection ratio≥98%, the higher water inflow pressure, the higher membrane salt rejection ratio, the better ... maintain pressure for 50minutes, 100,000 water hammer test, conforming to Europe standard. Water tube and fitting: the same quality as ...