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This is our first winter with our pool! Our spa is situated in a corner of our pool and level with our pool, and I believe circulates through the same water as the pool. We live in NC, where the weather stays fairly mild over winter. Since we want to use the spa over winter, I feel like we...

Here were my results. Cya was tricky for me- I have good eyesight and while the black dot was hardly in view most of the time, I could still see it until the very end. Cl=the darkest yellow, possibly above 5? Does this matter if I did the other chlorine tests? pH=7.8 FCl=8 CCl=1 TCl=9...