Hello everyone. I am new to the forum, but have found it very informative already. I'll try to do an intro at another time. Here is my haunting question. What do I need to do to increase my ORP value? Depending on whether you subscribe to the saturation index range of -0.5 - +0.5, or if you prefer the -0.3 - +0.3 range, my pool water currently may or may not be balanced as my calc was the former. However, my ORP meter only shows 412mv which is far less than the 650mv said to be a minimum figure for good sanitation? The only thing I can think of is that my CYA needs to be lowered. My readings today were as follows:
I also had a Phos level of 150, and TDS of 1200. Any thoughts? Oh yes. I purchased some ORP calibration fluid at 400mv. The meter read just over 400mv before I calibrated it to read 400mv on the nose. Granted, it is only a relatively inexpensive meter (HM ORP-200), but I believe it is reading correctly.