Dear Dharmendra, Since how ...
Published by Engr. Mansoor Ahmed PhD. Scholar, Consultant/Advisor Water/Wastewater Treatment - Consultant
Dear Dharmendra,
Since how long you are using these membranes
Do you follow Cleaning / Flushing CIP of RO Membranes as per DOW recommendations on timely intervals
Did you check your Inlet TDS, if this is same or changed?
Do you have a Pre-Filtratioin System before hand also which is functioning well?
Did you check ORP Meter is funcitioning well if you are using NaOCl as disinfectant in pre-filtration?
Does your SMBS Dosing Pump functioning well?
Does Cartridge Filter cleaned properly or needs replacement?
The most important, if you recently cleaned/opened the Vessel, then inserting membranes into the vessel is a careful job, each membrane module to be properly "Interlocked" and "Rubber O Ring" must be in place properly, otherwise, this could be the main reason for your issue.
Increase in Permeate TDS and Decrease in Reject TDS is a clear indication any of your Membranes has worn out/damaged/clogged thus not being able to perform properly the system as a whole.
Kindly do the above checks first, then take out membranes. I am sure your problem will be solved.