New here and this is my first post. In fact I'm new to the whole pool/spa maintenance thing, but I just completed the CPO class. I have a 1,000 gallon hot tub, which is using hydrogen peroxide and U/V light to sanitize.
I cannot get the pH to come down and stay down at a reasonable level. In fact I cannot get it down even to 8.2. If I drain the tub and refill, which I have done twice in a month, the pH of the new water starts at 7.4/7.5.
Here are the values I measured just after filling the spa:
I turned on the heater and the circulator pumps, left it for 24 hours, and the pH has risen off the chart. Other than temperature (95 degrees,) the other numbers have not changed.
What is causing this, and what do I need to do to keep the pH down?
I'm beyond measuring for the "correct" amount of chemical to add. I've added up to 8oz. of muriatic acid at a time, no help, and one pound of sodium bisulfate. No change.