I have a very strange problem. Both the total and free chlorine are sky high and remain that way, even if I don't add any chlorine.
My pool was green with algae and at the time the PH and alkalinity were both very low (off the scale). I shock treated the pool with 6 cups of granule chlorine and the next day I added 2 Kg (about 4.4 lbs) of "Alkalinity up". After a few days the alkalinity and ph were still extremely low. I then added another 2 Kg of "Alkalinity up" and the alkalinity and ph were now just below normal. The pool however was still green, so I shock treated it again with HTH shock-it which is chlorine based. After this the total chlorine and free chlorine remained super high (off the scale), even after 2 weeks of no chlorine added, in very sunny weather.
Here are the details:
Pool volume: 60,000 litres (15,850 US gallons)
Total hardness: 250 ppm
Total chlorine: > 10 ppm
Total Bromine: > 20 ppm
Free chlorine: > 20ppm
Total Alkalinity: 70 ppm
Cyanuric acid: 40 ppm
Water color: turquiose and very cloudy
The above were measured using an AquaChek7 strip
I have confirmed the total chlorine reading using an AquaCheck strip and also an HTH test kit.
I would appreciate it if someone would please tell me what is happening and what I should do.