... being pretreated reaches the requirement of the RO system. So as to make the RO equipment run stably during a long period.The ... , the filter should be backflushed every week.3.4The RO device.The RO device removes the hydronium, organic substance, colloid, bacteria ... high-pressure pump, the middle tank, the pressure vessel, the RO membrane module, the pressure gauge, the flowmeter, the conductivity ...