Maybe best if you can send a membrane unit off for analysis to a specialist to see what went wrong. I've never heard of weighing the membranes to determine which is the most fouled but maybe it can be done. Perhaps not very helpful advice now but maybe worth always having a spare sealed membrane unit in store so you can try changing out different existing units. Osmotic backflow, which a well designed plant should allow but many do not, happens on each shutdown. Flow back THROUGH the membrane helps to clean it, instead of a CIP which washes OVER the feed surface. I can recommend an Australian consultant to provide advice but I guess you are in Mumbai and that is problematic.

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Maybe best if you can send a membrane unit off for analysis to a specialist to see what went wrong. I've never heard of weighing the membranes to determine which is the most fouled but maybe it can be done. Perhaps not very helpful advice now but maybe worth always having a spare sealed membrane unit in store so you can try changing out different existing units.

Osmotic backflow, which a well designed plant should allow but many do not, happens on each shutdown. Flow back THROUGH the membrane helps to clean it, instead of a CIP which washes OVER the feed surface.

I can recommend an Australian consultant to provide advice but I guess you are in Mumbai and that is problematic.