... sand filter,4) There is over-pressure protection available for high pressure pump, when pressure is over 6.8Mpa, the system ... for attention.5) High pressure pump equipped with low-pressure protection device, when pre-treated sea water pressure is less than 0.05Mpa ... parameter (Raw water flow, product flow, brine flow, operation pressure, product water conductivity)7) If the product water is unqualified ...