Originally Posted by dino (Post 1011854)

you have a reading of 2ppm of free chlorine out of your tap? I find that really hard to believe gosh I keep our swimming pools at that. do you mean .02 because that would make sense

Originally Posted by Myka (Post 1011833)

I test the water from my RO/DI after carbon and before RO membrane (I installed a tee and ball valve just for this purpose) about once a month. The tap water here has about 2 ppm chlorine and the single 1 micron carbon block on my RO/DI has no problem breaking the chloramine bond and removing the left over chlorine. I think the people selling the chloramine blocks are doing a good job advertising. :)

Chlorine also damages RO membranes really badly and really quickly. Any chlorine getting to it is going to wreck the membrane in no time. If typical carbon blocks didn't work good enough I think we'd see a lot more people with toasted RO membranes.

My RO membrane is over 6 years old, has made thousands of gallons of water and still puts out only 3 ppm (about 260-280 ppm tap water). No way could my membrane last this long if chlorine was getting to it.

Originally Posted by TimT (Post 1011950)

If your getting chlorine out of your ro unit then the carbon filter is exhausted and the chlorine will have eaten your ro membrane as well, especially if it's a CTA one. I'd recommend replacing both and then increase the frequency of carbon filter replacement.