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Oh, hmm, my conductivity probe is in my kalk reactor 24x7. I had better take it out and clean it and see if the readings rise.I agree, a conductivity probe is the best way. I wouldn't leave it there 24/7 as it may get coated with calcium carbonate. That is easily cleaned with weak acid, but may lead to false low readings until it is cleaned.
Oh, hmm, my conductivity probe is in my kalk reactor 24x7. I had better take it out and clean it and see if the readings rise.
Dennis