I have a 21k gallon vinyl liner in-ground pool. I’m having an issue with my inline chlorinator, a Pentair 320. I started the season by taking the whole thing apart and cleaning it. The control valve seemed to function fine (when set at 0, nothing passed through) and all of the tubing was clean and clear. When I put full 3” chlorine tablets in and turned the control valve to 5, the tablets wouldn’t break down and the chlorine levels in the pool were almost non-existent. (Testing with a Taylor kit, I would usually get a reading of 0 ppm.) This went on for more than a week. So I decided to break the 3” tablets apart. I put those in and my chlorine levels skyrocketed (even at a low setting of 1 on the control valve.) Testing with a Taylor kit showed chlorine levels around 7.5 ppm.
So, in order to reduce the chlorine levels, I turned the control valve to 0. However, even set at 0, I’ve found that tablets are still breaking down and entering the return stream. Shouldn’t setting the valve to 0 stop all flow out of the chlorinator?
I should mention I’m using the lower port on the chlorinator to connect to the control valve; the top port is sealed closed.
So, in order to reduce the chlorine levels, I turned the control valve to 0. However, even set at 0, I’ve found that tablets are still breaking down and entering the return stream. Shouldn’t setting the valve to 0 stop all flow out of the chlorinator?
I should mention I’m using the lower port on the chlorinator to connect to the control valve; the top port is sealed closed.
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