Dear Dharmendra, The ...

Dear Dharmendra,

The following points may check.

1. Sealing system of the RO membrane (gasket looseness/damaged) to be checked.
2. By passing of the membrane.
3. Check connection of water IN/OUT
4. Check damaged of membrane, due to uneven pressure
5. Have your composite membranes been exposed to chlorine or any other strong oxidant? The exposure may have damaged the membranes.
6. Have your cellulose acetate (CAB) membranes been exposed to pH extremes? The exposure may have damaged the membranes. Likely causes of pH extremes are faulty metering pumps, acid tanks that have gone dry, loss of prime to the metering pump, or flushing/storage in non-acidified water.
7. Is the instrumentation accurate? Verify that all of your instruments are calibrated properly.
8. Do the elements look discoloured or damaged? Inspect the RO elements for foulants or physical damage.