Just opened the pool 3 days ago, and the water was clear - Yay! Currently, FC=16, pH=7.5, TA=70, and CYA=40. But today, when I performed a daily chlorine test, the test turned bright orange! I am using last season's test kit, (waiting for delivery of new set), but the kit has been stored in a climate-controlled environment. Any suggestions are appreciated.
Chlorine test turns orange
- Thread starter TerryTeeds
- Start date
Orange on the block test ? If so, orange is 10+ FC with a similar range as it is for yellow, from light to dark. (Albeit not exact).
- May 23, 2015
- 25,755
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
OTO turns orange above 10ppm FC and starts to go very dark orange, even brown, at higher FC. The color is consistent with your 16ppm measurement from using the DPD-FAS titration test. OTO is not very accurate and should only be used a test for the presence of chlorine, not to obtain a reliable or accurate number.
Thanks! I just realized my Pool Math target FC was set to SLAM level and not maintenance, so pool is currently over-chlorinated. I'll just let it come down naturally.