The mass important for the ...

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The mass important for the system, the feed pump for the second RO must synchronize with the permeate 1st RO, Otherwise the feed pump for 2nd RO will make vacuum if rate 2nd pump RO  > rate permeate 1st RO. Vacuum will make failures the membranes in 1st RO. So you you must control the flow rate for rate permeate and flow rate 2nd feed pump and or recirculated small part to the pipe feed line after the install checked valve.