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Was doing some testing on my RO water and found like 2 to 3 PPM of nitrites! Flushed the membrane, drained the head tank and flushed it. Did some testing after that and back to 0 PPM. I let the system fill the head tank and sit over night. The next morning it tested .5 PPM of Nitrites. That made me think something was going on in the head tank. The tank has been in service for about 4 years. So, I ordered a new head tank. Tank arrived and I flushwd every thing again and installed the new tank. While filling the system I tested 0 PPM. Let it sit over night and I got .5 PPM nitrite again. When I isolate the tank and test the water coming right out of the RO I get 0 PPM. This is a 5 stage filter array. All filters about 3 months old. RO membrane about 1.5 years old. I would hate to replace all filters and membrane just to get nitrites again. My tap water tests at 0 PPM. Any ideas or how to eliminate? The RO TDS is around 15. I am using an API freshwater master kit. Nitrite bottle is good until 02/2019. We use this system for drinking and WCs in my daughters betta tank.
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What's your incoming number? The membrane is going to reduce...but not necessarily eliminate all nitrates and nitrites.Originally posted by Bgmac View Post -
I tested the incoming (tap water) several times and get 0 PPM every time.Originally posted by pawaterguy View PostComment
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That is strange. It almost has to be in the tank. But, I don't know. You'd be better off calling a testing lab and asking if they've ever run into it and see what their experience has been.Originally posted by Bgmac View PostComment
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Good advise. Was doing some reading and think it might be very small traces of ammonia getting by due to high chlorimine levels in the tap water. Going to try adding a granular catalytic carbon filter to pull chlroimine out before the RO membrane.Comment
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