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I did the cup test and only saw a difference of 5 points, 740 vs 735 so it does not seem to be a voltage issue. I also hooked 2 #8 wires to the panel in the equipment room - one to the neutral bar; one to the ground bar and pulled them both out to the pool area and read the following voltages...

Good day Valera Orlingus, Thanks for taking the time to look at the plots and for your advice. We will see if we can find out what is in the water. Bubblehead

I have an 8 day plot of ORP and pH but is too big to post here. If anybody is interested in looking at it let me know and I will send you an email. I have hand plotted FC hand readings and calculated ORP values on the system generated plot. It clearly shows an oscillation in ORP that is not...

I did not get a chance to redo the voltage tests today but I will tomorrow and I'll do the cup test at the same time. Thanks

Thanks for your responses. Looks like quite a few excellent suggestions and some questions for me to answer. So let's get started. We have replaced the entire controller, wires and probes on two of the pools. The symptoms remained the same. The equipment we are using is as follows: Acu-Trol...

I have been searching the internet for possible solutions to a recent problem that has occurred at our facilities. I came across TFP and was thoroughly impressed with the knowledge and communication skills of your chemistry experts. They are way beyond my knowledge so I am hoping they will be...