chem geek wrote:
Your pH is rising because your TA is too high. 120 ppm is NOT the target you should be shooting for. When using hypochlorite sources of chlorine, it should be far lower, usually no higher than 80 ppm and if your pH is still rising too quickly at that TA you could go even lower, but for now get it down to 80 ppm using the procedure I gave to you. If you lower the pH to 7.0, then it should rise reasonably quickly so that you can add more acid to keep it down -- the early phase of lowering the TA will be faster and easier. Right now with the pH rising so quickly, you don't really need to worry about aerating -- you should instead be adding acid more frequently to keep the pH down at 7.0 during this process. As the TA gets lower, the rate of pH rise will slow down so the process takes longer, but then again that's near the end of where you need to be since the goal is to slow down the rate of pH rise.
The TA moves a little with the pH so don't worry about the "bounce" of it. It's just way too high and is causing your pH to rise, period. Remember that it takes 25-1/2 fluid ounces of full-strength Muriatic Acid (31.45% Hydrochloric Acid) to lower the TA by 10 ppm in 10,000 gallons. Use The Pool Calculator
to calculate dosages but you won't be adding the total amount of acid to lower the TA at once, but instead add enough to get to 7.0 pH during this TA lowering process (again, read the procedure I linked to).
Finally got some dry acid after pH was over 7.8 for three days the finally went to 8 and above.
I had to beg for the acid or I'd've had to buy it myself.
I dosed it last night in two steps, one to get it to 7.8 and then a second dose. pH is down to 7.2 this morning with TA at 110. I still don't have the means to aerate so I'll have to let pH rise and add some more over time.
Not much choice. I'm not going to be given the funds to get a pump for making bubbles and 7.2 is at least swimable though we've had a downshift in night temperature and the water is too cold to swim the last last week.
Money talks!? All it ever says to me is "goodbye!".