The ReefBox Posted October 18, 2017 Share Posted October 18, 2017 So to make a long story somewhat short here is my dilemma i have a Spectrapure 5 stage ro/di unit and lately my membranes are only lasting 2-3,months. It was a 180 gpd unit but I pullled one of the membranes off as I did not need that much when I replaced membrane ($$$$$) I run a booster pump and keep PSI AT 80 my garage temp is roughly 60 and I flush membrane whenever I do water changes. The rejection rate is 99% ($$$) and waste ratio is 3:1 TDS in is only 80 so for the life of me cannot figure out what could foul it so quick to the point it takes 3-4 days to make 30 gallons it is hooked up to a float valve on main system and I eveporate4-5 gallons total per day Membrane/filters and both DI canisters we’re swapped for new on 7/28/17 and now can hardly make any water thoughts??? Brian Quote Link to comment Share on other sites More sharing options...
albertareef Posted October 18, 2017 Share Posted October 18, 2017 Hey Brian, where are you measuring pressure? I have seen some pretty big pressure drops across the canister filters in front of the RO membrane when they have become clogged due to water supply issues. Just wondering if that might be happening to you so the membrane isn’t really getting fed at 80. I never figured out what the issue was with the supply but just kept having to swap out the micron and carbon filters until it went away. Might have been work on the city supply kicking up debris. Quote Link to comment Share on other sites More sharing options...
The ReefBox Posted October 18, 2017 Author Share Posted October 18, 2017 2 minutes ago, albertareef said: Hey Brian, where are you measuring pressure? I have seen some pretty big pressure drops across the canister filters in front of the RO membrane when they have become clogged due to water supply issues. Just wondering if that might be happening to you so the membrane isn’t really getting fed at 80. I never figured out what the issue was with the supply but just kept having to swap out the micron and carbon filters until it went away. Might have been work on the city supply kicking up debris. Im 80 before and 75 after. I install a gauge a long time ago to ck this very issue Quote Link to comment Share on other sites More sharing options...
chewie Posted October 18, 2017 Share Posted October 18, 2017 You probably have a lot of sediment in your supply. Change the prefilters more frequently. Quote Link to comment Share on other sites More sharing options...
xmas_one Posted October 18, 2017 Share Posted October 18, 2017 Are you running a carbon block? Also what is the chlorine residual of the raw water? Chlorine and chloramines will tear up a membrane in a hurry. Quote Link to comment Share on other sites More sharing options...
The ReefBox Posted October 18, 2017 Author Share Posted October 18, 2017 1 hour ago, chewie said: You probably have a lot of sediment in your supply. Change the prefilters more frequently. I have a pressure gauge on both side of my pre filters and not changing much at all??? Quote Link to comment Share on other sites More sharing options...
The ReefBox Posted October 18, 2017 Author Share Posted October 18, 2017 38 minutes ago, xmas_one said: Are you running a carbon block? Also what is the chlorine residual of the raw water? Chlorine and chloramines will tear up a membrane in a hurry. I use a chloramine buster cartridge also Quote Link to comment Share on other sites More sharing options...
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