ryanjury Posted December 10, 2009 Report Share Posted December 10, 2009 Ok I have this DI unit http://www.filters.co.nz/pdfs/DI%202%20 ... 0APP68.pdf The problem I am having is that the DI resin is getting used up exceptionally fast, initially I only got the resin and didn't replace the prefilter and it only did 50-100L before the resin all went gold and the water coming out was higher than 200uS (initially it was 5uS which I was happy with). Last night myself and a friend packed the entire prefilter stage with activated carbon and now after less than 100L again the resin is all used up and output gone high again. At this stage I think I am only left with a few options why it is using it so fast. 1. The input water is so fill of crud that the resin is having to work overtime. 2. I need to buy the proper pre filter (but I don't know how much good the 10micron will actually do? I thought the carbon would have done the same job?) Quote Link to comment Share on other sites More sharing options...
suphew Posted December 10, 2009 Report Share Posted December 10, 2009 You need to buy an RO stage. Quote Link to comment Share on other sites More sharing options...
Ira Posted December 10, 2009 Report Share Posted December 10, 2009 Yup, get an RO. DI gets used up extremely quickly if it's soaking up 1000PPM from straight tap water rather than polishing off the last 5ppm after an RO filter. Quote Link to comment Share on other sites More sharing options...
ryanjury Posted December 10, 2009 Author Report Share Posted December 10, 2009 Can I easily plumb an RO stage into the existing 2 stage that I have? I am assuming it would go between the prefilter and the DI stage and would also have to put something in for back flushing? Roughly how much would a membrane and holder cost? Quote Link to comment Share on other sites More sharing options...
Ira Posted December 10, 2009 Report Share Posted December 10, 2009 Can I easily plumb an RO stage into the existing 2 stage that I have? I am assuming it would go between the prefilter and the DI stage and would also have to put something in for back flushing? Roughly how much would a membrane and holder cost? Hmmm...Don't think you need to backflush RO membranes or that you can even do it without damaging them. The 80% waste water is constantly cleaning the membrane. Yes, you should be able to easily plumb it in your current setup. Quote Link to comment Share on other sites More sharing options...
ryanjury Posted December 11, 2009 Author Report Share Posted December 11, 2009 Ok cool for some reason I thought that it had to be back flushed.. Would I just have to jimmy up fittings and put it inbetween the prefilter and DI stages? Quote Link to comment Share on other sites More sharing options...
suphew Posted December 11, 2009 Report Share Posted December 11, 2009 They usually do have back flush, but I think it just washes water over the dirty side of the membrane rather than thought it. It's just a tap, not sure exactly how it is plumbed in to work, I assume it bypasses a pressure valve to let the flow run over the membrane Quote Link to comment Share on other sites More sharing options...
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