If the RO rejection rate reaches what percentage, the membranes must be replaced?

The remark about membrane replacement when the reverse osmosis (RO) rejection rate reaches a specific percentage is crucial in maintaining the efficiency and performance of the filtration system. The rejection rate is a measure of how effectively the membrane can separate contaminants from the feed water.

When the rejection rate drops to around 80%, it indicates that the membrane is no longer effectively filtering out a significant portion of dissolved solids, impurities, and other contaminants from the water. This level of performance degradation could lead to compromised water quality, which is especially critical in medical and laboratory settings where water purity is paramount.

Replacing the membranes at this threshold ensures that the system continues to function optimally, maintaining the required water quality standards and protecting downstream equipment and processes from potential damage due to inadequate filtration. A rejection rate at or below this point indicates a risk of cross-contamination, which can have serious consequences.

The other percentages represent varying levels of acceptance for membrane efficiency but do not reflect the industry standard for immediate replacement needs. Hence, 80% has been identified as the threshold for intervention.