What to look for in chlorine testing kit & RODI carbon for chloramines?

[USC-fan]

I have chloramine in my city water. I see randy suggest the hanna CN-70 kit that has both total and free chlorine tests. Do i need both? Hanna offer just a total chlorine test kit.

Also i see bulk reef supply suggest using refillable carbon to be second stage. They use "Catalytic Activated Carbon" i take this is different from normal carbon and what you should be using?

 

[bertoni]

I never bothered with chlorine testing when my water supply had chloramine in it. If you want to measure chloramine, though, you will need to test both parameters.

The catalytic activated carbon will work a bit better with chloramine, but the difference might not matter. I just used a standard carbon stage, and it did the job well. Do you know how much chloramine is in the water from your supplier? There's a range that is considered acceptable.

 

[USC-fan]

My city water uses very high amounts i believe and the last test they put out it was 3.11 PPM and PH is high at 7.78.

 

[bertoni]

Hmm, that's on the high end. I might ask a vendor about a carbon block tuned for chloramine.

 

[Buckeye Hydro]

CGAC is different that GAC - yes.