Thank you for all your replies. How bad it is if i keep using it. And how long does it last?  The contractor cleaned the element with fresh water @3bar. I also warned them on the damages when reversing flow from permeate port.

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Thank you for all your replies. How bad it is if i keep using it. And how long does it last? 

The contractor cleaned the element with fresh water @3bar. I also warned them on the damages when reversing flow from permeate port.