Sherita Posted April 5, 2013 Share Posted April 5, 2013 Yes, I'm just curious, that's all. I've been told that running chloramines through the ro membrane can damage it. I'm just wondering if any chloramines are mmaking it through your carbon. Quote Link to comment Share on other sites More sharing options...
victoly Posted April 5, 2013 Author Share Posted April 5, 2013 Seems like a good thing to know, I'll get on it this weekend. Quote Link to comment Share on other sites More sharing options...
Buckeye Field Supply Posted April 11, 2013 Share Posted April 11, 2013 (edited) ...any amount of chloramine that makes it through the carbon to the membrane can cause damage to the membrane over time and dramatically shorten the life span of the membrane. That is true for chlorine, but not necessarily true for chloramine. You can expect damage in as little as a 1,000 ppm hours from chlorine, but they tested Filmtec membranes up to 300,000 ppm hrs and didn't see damage from chloramine. The problem is that if you have chloramines, you likely also have some free chlorine. If you have chloramines, and if you have adequate carbon contact time, and if your pH is over 7.2, you may also see membrane damage and reduced DI life from ammonia. Below 7.2 the ammonia will be present as ammonium and should be largely rejected by the membrane. Russ Edited April 11, 2013 by Buckeye Field Supply Quote Link to comment Share on other sites More sharing options...
victoly Posted April 11, 2013 Author Share Posted April 11, 2013 Our pH is generally well above 7.2 out of the tap. Quote Link to comment Share on other sites More sharing options...
victoly Posted April 21, 2013 Author Share Posted April 21, 2013 For sherita, I tested chloramine out of the 2nd CGAC (mechanical->CGAC->pentex->sample) and got 0.00. My CGAC/pentek are now one month old. I'll test out of that port every month to see if I start to get some chloramine creep. Quote Link to comment Share on other sites More sharing options...
victoly Posted June 20, 2013 Author Share Posted June 20, 2013 About 5 months out and still no measurable total chlorine. 1 Quote Link to comment Share on other sites More sharing options...
victoly Posted July 20, 2013 Author Share Posted July 20, 2013 So i finally got my Hanna 761 in today. It reads total chlorine in the ppb range (+/- 5 ppb)! My RODI with CGAG reads 12 ppb or 0.012 mg/l. My CGAG and pentek are roughly 6 months old, and I'm guestimating that they have produced ~500 gallons of total water. I'll take readings of the whole system tomorrow and see what I come up with. Quote Link to comment Share on other sites More sharing options...
victoly Posted July 24, 2013 Author Share Posted July 24, 2013 Total chlorine out of the CGAC (pre-pentek) is 0.05 mg/l. I'll test out of the pentek (into the RO membrane) when I get an opportunity. Quote Link to comment Share on other sites More sharing options...
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