mhart032 Posted July 9, 2009 Share Posted July 9, 2009 I recently bought an RO filtration system. its a 24gpd, my question is can i put a 50gpd membrane in it? their is no size difference b/t the 24 and 50 so the 50 will fit.. also can i use any membrane for any RO as long as it fits? Quote Link to comment Share on other sites More sharing options...
medi Posted July 9, 2009 Share Posted July 9, 2009 I believe so, but you need to change the flow restrictor to a 50 GPD Quote Link to comment Share on other sites More sharing options...
mdavis735 Posted July 9, 2009 Share Posted July 9, 2009 i am pretty sure that is all you would need to do.just change the flow restrictor and the membrane.one thing to keep in mind before going too high is that from what i have heard the less gpd ones have a higher rejection rate than the more gpd ones. Quote Link to comment Share on other sites More sharing options...
mhart032 Posted July 9, 2009 Author Share Posted July 9, 2009 hrmm what does the flow restrictor look like? i dont see anything that looks like a restrictor. Quote Link to comment Share on other sites More sharing options...
jsr Posted July 10, 2009 Share Posted July 10, 2009 I converted my 50GPD to a 75GPD by just changing the membrane and restrictor. The flow restrictor is usually in the drain line. On my unit, I unscrew the drain line from the fitting and the restrictor sits right there. They are like $2 to replace. Hope this helps, feel free to PM with and questions. Quote Link to comment Share on other sites More sharing options...
mhart032 Posted July 10, 2009 Author Share Posted July 10, 2009 Ive checked all the hoses and through out the unit and i dont see one. unless its built into something or maybe it doesnt have one. it seems to be fine making good water and fairly quick.. maybe it was already pulled off prior.. Quote Link to comment Share on other sites More sharing options...
jsr Posted July 10, 2009 Share Posted July 10, 2009 If there is no flow restrictor, you are not making RO water. Be sure to look inside the fitting that comes off the RO housing. On my unit, if I remove the waste tube from the 90* elbow, the flow restrictor is inside the fitting. Some are actually slipped into the end of hose that connects to the fitting. Quote Link to comment Share on other sites More sharing options...
mhart032 Posted July 10, 2009 Author Share Posted July 10, 2009 oh ok it mite be their. ill look again. mine is a coralife pureflo II premium.. Quote Link to comment Share on other sites More sharing options...
jsr Posted July 10, 2009 Share Posted July 10, 2009 oh ok it mite be their. ill look again. mine is a coralife pureflo II premium.. Same here. I just upgraded it to a higher capacity. In that case, the restrictor is in the 90* waste water joint (red tube). Mine was gray, but the color changes depending on the rating. Quote Link to comment Share on other sites More sharing options...
mhart032 Posted July 10, 2009 Author Share Posted July 10, 2009 ok, i noticed their was one elbow that looked alittle different.. ill check it when i get home.. Quote Link to comment Share on other sites More sharing options...
mhart032 Posted July 11, 2009 Author Share Posted July 11, 2009 i looked at the elbows and the hoses again and they are the same from the membrane the red and blue... Quote Link to comment Share on other sites More sharing options...
mdavis735 Posted July 11, 2009 Share Posted July 11, 2009 i had an old coralife 24 gpd unit that did not have a flow restrictor.i dont know how or why but it didnt.both the 75 gpd and 100gpd membranes i have had one and i would assume to change to a different flow rate membrane you would need to change it.it was a white platic tube with male fittings on each end.it has a valve on it to turn either to make water or if you open it it flows fast from the waste tube "flushing" the membrane. Quote Link to comment Share on other sites More sharing options...
mhart032 Posted July 11, 2009 Author Share Posted July 11, 2009 This, one is pretty simple. it doesn't have anything like that. no shutoffs or valves. it is possible that it was taken out and a bigger membrane was already used before.. Quote Link to comment Share on other sites More sharing options...
medi Posted July 11, 2009 Share Posted July 11, 2009 you can order the different flow restrictors from buckeye field supply and just place it in your drain line. I have always been under the impression that you had to have some sort of flow restrictor. Would it be possible that there is a built in flow restrictor somewhere on the drain side of the unit? Quote Link to comment Share on other sites More sharing options...
mhart032 Posted July 11, 2009 Author Share Posted July 11, 2009 Im not sure, im not sure if its in the waste water side why it would be needed. all its doing is restricting the flow rate of the waste water but if its in that line its already been filtered if its thats far down the line through the membrane. but even the waste water doesnt pour out.. its making about 48gpd.. i tested the ro it tested out fine.. Quote Link to comment Share on other sites More sharing options...
medi Posted July 11, 2009 Share Posted July 11, 2009 From what I read if you don't have the membrane and the flow restrictor that match outputs then it can either cause excessive waste to the drain or premature membrane fouling Quote Link to comment Share on other sites More sharing options...
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