jonas Posted May 25, 2011 Share Posted May 25, 2011 I am wondering what the best water temp is to pump into my RoDi unit? Is it true that if it is warmer than your out side hose water it will not waste as much?Should also produce faster right? Link to comment Share on other sites More sharing options...
Gabe Posted May 25, 2011 Share Posted May 25, 2011 I'm pretty sure the instructions on my filter said cold water only or you can damage the membrane. Link to comment Share on other sites More sharing options...
titus'reef Posted May 25, 2011 Share Posted May 25, 2011 Cold water, for sure. I just bought an RO/DI from BRS and they say to use only cold water only. Link to comment Share on other sites More sharing options...
jonas Posted May 25, 2011 Author Share Posted May 25, 2011 This is what i found on the web.Water Temperature - The ideal operational temperature should be 70° to 77°F. Low water temperatures like 50°F restrict the output to half. NEVER run hot or mixed hot/cold water through the R/O unit. Only run COLD water.If i can get my water to a steady 70 degrees would be ok right? Link to comment Share on other sites More sharing options...
Smann Posted May 25, 2011 Share Posted May 25, 2011 I just run whatever comes out of the hose bib, winter its a little cooler, summer a little warmer. Right now its 65 degrees Link to comment Share on other sites More sharing options...
J.R Posted May 25, 2011 Share Posted May 25, 2011 If you look at the below thread it will show you what I did and a few posts later it tells you why I did. http://www.pnwmas.org/forums/showthread.php?23968-J.R-s-180/page2 If you run just cold tap it will reduce your output and increase your waste water. Edit: your TDS will be the same either way though. Link to comment Share on other sites More sharing options...
jonas Posted May 25, 2011 Author Share Posted May 25, 2011 Thank you for that info.My water temp out of my hose now is 53.My pressure is at 65.I have a 150 gal per day unit.It is at half of that.I will figure out how to fix this problem. Link to comment Share on other sites More sharing options...
reef165 Posted May 25, 2011 Share Posted May 25, 2011 Yes warming your water will increase your output, but so will adding a booster pump, so you gotta way the options and see what is more cost efective. I have been thinking here recently about the whole waste water, using warmer water and such and maybe someone here can chime in on if it will work. Lets say you bring your water in from the hose to a float valve on a barrel, then you plumb from the bottom a supply to a booster pump that feeds the RO/DI unit, then the good water goes to a good water barrel, and the waste water goes back into the first, resevoir barrel. As the good water is made it will allow more water to come into the barrel, and the waste water will be prosessed over and over again. Then maybe just drain the resevoir barrel once a week or something to purge the really bad water. You could also heat the resevoir barrel with a small heater if you like. What do you think? Link to comment Share on other sites More sharing options...
impur Posted May 25, 2011 Share Posted May 25, 2011 Yes warming your water will increase your output' date=' but so will adding a booster pump, so you gotta way the options and see what is more cost efective. I have been thinking here recently about the whole waste water, using warmer water and such and maybe someone here can chime in on if it will work. Lets say you bring your water in from the hose to a float valve on a barrel, then you plumb from the bottom a supply to a booster pump that feeds the RO/DI unit, then the good water goes to a good water barrel, and the waste water goes back into the first, resevoir barrel. As the good water is made it will allow more water to come into the barrel, and the waste water will be prosessed over and over again. Then maybe just drain the resevoir barrel once a week or something to purge the really bad water. You could also heat the resevoir barrel with a small heater if you like. What do you think?[/quote'] I think this is a good idea, but running the waste water back thru the RODI will reduce the life of your membrane and filters much faster. Link to comment Share on other sites More sharing options...
J.R Posted May 25, 2011 Share Posted May 25, 2011 I think this is a good idea' date=' but running the waste water back thru the RODI will reduce the life of your membrane and filters much faster.[/quote'] Thats what I heard to and membranes aint cheap! This is what Kent says regarding output on RO units.. "There are certain factors that lower product water production. The first is water pressure. The ideal water pressure should be 65 psi. A water pressure of 45psi will reduce the rated Gallons Per Day(GPD) by one half. The second condition is water temperature. The ideal operational temperature should be 70 o to 77 o F, 21 o to 25 o C. Low water temperatures like 50o F, 10 o C restrict the output to half. NEVER run hot or mixed hot/cold water to the unit. Only run the cold water. The third and final condition is the TDS or Total Dissolved Solids of the tap water. These units are rated for 200 ppm(parts per million) of TDS. High TDS can also lower output." If your pressure is at 65 Jonas I think you are sitting pretty good. Link to comment Share on other sites More sharing options...
reef165 Posted May 25, 2011 Share Posted May 25, 2011 I just did a bit of digging and found that the NO Waste RO/DI's Use a booster pump and send the water back into the system on the hotwater side. Kinda seems like a loop in itself and some of the water would be ran twice, but much less of it. Link to comment Share on other sites More sharing options...
J.R Posted May 25, 2011 Share Posted May 25, 2011 Interesting. I didnt think that was a legal install for some reason (the exact term excapes me right now) but its an interesting way of doing it. That way you arnt actually re-using the dirty water when it goes back into your membrane, or at least for the first few gal's depending on your heater size. Link to comment Share on other sites More sharing options...
J.R Posted May 25, 2011 Share Posted May 25, 2011 Now I remember, it’s called backflow and there are laws against it. I am not positive that doing this with an RO would be illegal but there are deffinantly rules in Oregon regarding backflow and plumbing. I know right after 9/11 allot of water providers and Government types were worried about it and what terrorists could do with backflow and poisons and such. Anyways it’s an interesting idea. Link to comment Share on other sites More sharing options...
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