noah Posted May 12, 2018 Report Posted May 12, 2018 390 gal hot tub can’t measure free mchlorine. Added 5 scoops of R-0870 and still no pink. New Taylor kit and chemicals. Hot tub was unused for many months. Added multiple spoonfuls of Clorox pool and spa chlorinating granules and ran jets. Anything else I should do? Quote
Cusser Posted May 13, 2018 Report Posted May 13, 2018 1. Take a FRESH sample of water to a pool store for free test. 2. Run to Home Depot or pool store and try a different kit. Quote
noah Posted May 13, 2018 Author Report Posted May 13, 2018 A new kit, and measuring immediately after adding resolved the problem. Looks like chlorine goes away pretty quickly if there is lots of bacteria. So I suspect the first time I added, the chlorine got used up and was all gone before the next time I tested it. Now I can measure it properly. Noah Quote
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