 Re: R O filters
You should look to the manufacturer for that. But mine says to flush it for 60 seconds at least once a week and maybe daily depending on the quality of your feed water.
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90 gallon reef, mag 1800 main return pump, 10 gallon refugium + 10 gallon sump, CPR overflows, ASM G-1 skimmer, icecap 660 vho 440 watts. 130#LR and 60#LS. Corals: Finger Leather, Fat Finger Leather, Toadstool, flower pot sps coral, hairy mushrooms. Fish: Yellow tang, Bi-color angel, pecula clowns, royal gramma, coral beauty angel, yellow tail damsel, blue damsel, Sergeant Major Damsel. Misc. hermit crabs, snails, flame scallop, Xenia | 
