Hi Anders;
I see several possible issues.
#1 - Your test result numbers suggest they came from a digital 'guess-strip' reader. These readers generate more digits than they actually read. In particular, most 'guess-strip' readers can't reliably distinguish pool water with 80ppm CYA from water with 35 ppm CYA. Essentially, your numbers tell me that we do not know what your pool test results are. They may be (by accident) nearly correct, or they may be far off. In your case, the CYA reading is the one that's most likely to be in serious error . . . and that's the result most relevant to your current problem.
You may want to consider getting a Taylor K2006 kit (Amazon link below), or another FAS-DPD drops based kit. (LaMotte makes one, but it's MUCH more expensive.)
#2 - Ozone and chlorine destroy each other. Fortunately, most ozone units sold in the US do not make enough ozone to have ANY effect on your pool, much less destroy your chlorine. But yours may be an exception. However, what most US ozone units do accomplish is sufficient aeration of your pool to strip carbonate alkalinity. You can find more complete explanations here:
ozone-as-a-swimming-pool-sanitizer.html
and here
lowering-swimming-pool-alkalinity-step-by-step.html
Till you've got your problem resolved, it might be best to turn off the ozone unit, and close the air intake, or ozone feed line.
#3 - Finally, once you get the K2006, you can check your SWCG output by comparing the FC level of a sample taken away from the pool inlet, with one taken just in front of the inlet WHEN THE SWCG HAS BEEN OWN FOR THE LAST 15 MINUTES. Consumer 'guess-strips' are NOT accurate enough for this.
There are other, Pool Pilot specific, possible issues that may exist as well.
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