It seems my PH and TA will not stabilize and slowly rise every week. What could be causing this? I'll attach today's numbers.
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Also, once you get your TA lowered, switch to a pH target of NO LOWER than 7.6 and don't add acid until it is above 7.8. Many people make the mistake of thinking that pH has to be 7.4 or 7.2 or some fictional number based on the pH of human tears, blah, blah, blah. Water pH anywhere from 7.2 to 7.8 is completely comfortable and manageable. When one tries to artificially lower the pH below 7.6, it never stays there long enough to matter and they usually wind up consuming all of their TA and getting into a bad cycle of baking soda and muriatic acid additions. If you target a 7.6-7.8 pH zone, it will typically give you a decent interval between acid addition. Your incoming fill water will provide all the alkalinity you need. In fact, one of the best ways to cut down on the pH rise and frequent acid additions is to cover the pool to keep the evaporation low.
Where is that spreadsheet from? Homemade? Pool Math one of the tabs? Nice!Even still, your TA seems to be returning to the 80-90 range. You could easily go down to about 60. Try allowing the TA to remain low in stages and that should help keep the pH from climbing so fast. Since your plaster was just re-done in Nov, it's probably still curing and driving-up pH on its own. That could take several months to slow down. Good to keep MA on-hand.
Oh, and remember ... your fill water (when used) may also increase TA which will in-turn increases pH.
PS - I like that spreadsheet you're using.