Circulation flushes dissolved foulants away from the membrane surface, and replenishes depleted cleaning chemicalThe higher the rate of circulation, the more energy the chemical molecules will have, and the faster the rate of cleaningMembrane cleaning at a high flowrate also creates turbulence and surface scouring to remove suspended solids and loose foulant. Don’t exceed differential pressure limits, If the feed channels are plugged with foulant, a high flow rate can cause the membrane elements to telescope, resulting in irreversible mechanical damageStart circulating at a lower flow rate while monitoring differential pressure (∆P)As the feed channels get cleaner, the ∆P will decrease, and you can increase the flow rate accordinglyDo always clean at 40 – 45 gpm per pressure vessel when cleaning 8” elements, but don’t ever allow differential pressure to exceed 10 psi per element.