+Daniel Posted March 30, 2009 Share Posted March 30, 2009 Hey guys, I have a 75gpd RO/DI from Bulk Reef Supply that is unbearably slow. My water pressure is fine. I get maybe 5 gallons in 5 hours. Is this normal? Because I hope it's not. The membranes aren't very old, but they were equally slow when I first got them anyway. Daniel Quote Link to comment Share on other sites More sharing options...
classclownfish Posted March 30, 2009 Share Posted March 30, 2009 What is the PSI on it? What temp is he room where you fill it in? What is the TDS reading for the water after it comes out? How much waste water are you generating per gallon of good water? Any signs of leaking? Also the attachment shows a graph showing the effect of PSI and temp on the results on your unti. Also the other things I asked might help figure out what's going on. 0901b80380074538.pdf Hey guys,I have a 75gpd RO/DI from Bulk Reef Supply that is unbearably slow. My water pressure is fine. I get maybe 5 gallons in 5 hours. Is this normal? Because I hope it's not. The membranes aren't very old, but they were equally slow when I first got them anyway. Daniel Quote Link to comment Share on other sites More sharing options...
TyLee Posted March 30, 2009 Share Posted March 30, 2009 Hey guys,I have a 75gpd RO/DI from Bulk Reef Supply that is unbearably slow. My water pressure is fine. I get maybe 5 gallons in 5 hours. Is this normal? Because I hope it's not. The membranes aren't very old, but they were equally slow when I first got them anyway. Daniel 75gpd /24 hours = 3.125 g/h. You are getting more output than you are supposed to. Quote Link to comment Share on other sites More sharing options...
caferacermike Posted March 30, 2009 Share Posted March 30, 2009 Heck yeah Reef Newbie. I was just about to go through all that and you beat me to it. Still to this day I cannot fathom why folks are always surprised by this. Quote Link to comment Share on other sites More sharing options...
GKarshens Posted March 30, 2009 Share Posted March 30, 2009 Not to be mean but your math is wrong. He said he is getting 5 gallons in 5 hours. That is 1 gallon an hour. Quote Link to comment Share on other sites More sharing options...
caferacermike Posted March 30, 2009 Share Posted March 30, 2009 Just noticed that it was 5g in 5 hours, not 1 hour. If you read several of the RO websites such as the FAQ on Buckeye, you'll see that several factors can cause your RO system to put out well below the stated amount. Things like water pressure, water temperature, and most importantly what your water is made up of can affect the output. I think I recall reading that if a filter is rated for 75g a day in perfect conditions that the average home can expect to see between 50-60g of water a day. I noticed a huge drop off of production when I move2d from Austin to Round Rock. When I lived in downtown Austin I was about 2 miles from the treatment plant right along the river. My pressure was near 110psi, the water was ultra clean to begin with, and soft. When I moved to Round Rock our initial TDS tripled, the PSI dropped to 80, and I noticed that the hard water and deposits severely impacted the production. Quote Link to comment Share on other sites More sharing options...
fishypets Posted March 30, 2009 Share Posted March 30, 2009 Make sure your waste line is not restricted. The unit I have has a flow restrictor and must be cut to size accordingly. Quote Link to comment Share on other sites More sharing options...
+dapettit Posted March 30, 2009 Share Posted March 30, 2009 Sorry I have to go back to my PC support days. Make sure there isn't a kink in any of the tubing. Quote Link to comment Share on other sites More sharing options...
+Daniel Posted March 30, 2009 Author Share Posted March 30, 2009 Thanks for the feedback guys. I'm not sure what the actual water pressure is, but it's plumbed to the cold water line on my kitchen sink. How do I figure out the actual water pressure? I'm getting about 1 gph, which is less than the 3+ you guys mentioned. I don't see any kinks or leaks and the output isn't restricted. Should I be feeding warm water instead of plain cold water? The TDS reads 0 on the output side. Should I still try a new RO membrane? Maybe the one I have is just a little defective? Which cartridges/filters do you guys use on the other canisters/stages? Quote Link to comment Share on other sites More sharing options...
classclownfish Posted March 31, 2009 Share Posted March 31, 2009 To determine the PSI many people use something like this http://www.google.com/products?hl=en&q...=1&ct=title . Check out the few product results towards the top. The PDF I linked on my first reply will show you a graph showing the relation between estimated gph of your filter at various pressure levels. But you have it plumbed to the right one (cold) but sometimes a person water pipe is too powerful or not powerful enough and that can effect your RO/DI unit. Also you may want to try measure how much waste water you are getting per gallon of good water. Typically 3-5 gallons of waste water for every gallon of good water is fairly common for most people. If you are seeing ratios beyond that it could be that your membrane needs to be replaced but you might want to verify water pressure first if you can to rule that out (or confirm it as the culprit). Thanks for the feedback guys. I'm not sure what the actual water pressure is, but it's plumbed to the cold water line on my kitchen sink. How do I figure out the actual water pressure? I'm getting about 1 gph, which is less than the 3+ you guys mentioned. I don't see any kinks or leaks and the output isn't restricted. Should I be feeding warm water instead of plain cold water? The TDS reads 0 on the output side. Should I still try a new RO membrane? Maybe the one I have is just a little defective? Which cartridges/filters do you guys use on the other canisters/stages? Quote Link to comment Share on other sites More sharing options...
Robb in Austin Posted March 31, 2009 Share Posted March 31, 2009 The meter on the unit should tell you your pressure. Contact Russ, he gives great customer service. Quote Link to comment Share on other sites More sharing options...
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