Pumping Muriatic Acid

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My pH recently rose to 7.9 and I tried to get it to 7.6 but was not successful so I left it at 7.7. Is that to be expected? Here is my log:

10/14: FC 5, pH 7.9 // added 36 oz MA
10/15: FC 6, pH 7.7 // added 11 oz MA
10/16: FC 6, pH 7.7 // added 11 oz MA
10/17: FC 5, pH 7.7 // added 11 oz MA
10/18: FC 6, pH 7.7 // maybe 7.65; can't get it down to 7.6; stopped trying
10/19: FC 6, pH 7.7, TA 60, CH 280, CYA 39
10/20: // not tested
10/21: FC 6, pH 7.7

Note that I have 50 ppm borates and my 15K gal pool is one year old.

p.s. It appears that I won't need to add the MA pump. The prior time my pH rose to 7.9 (on 9/22) I had added 1/2 gal MA. The pH dropped to 7.4 and then took until 10/14 to rise to 7.9. So I'm very happy that it took 23 days to rise back up.

Does that have anything to do with the lower amounts of daylight, more shade due to the trees on the South side and lower temperatures?

Also note that I've been advised to not add 1/2 gal but just enough to get it to 7.6 so that was my target this time - but I never got it that low.
 
I would say that your pH control is a success. The pool seems happy at 7.7 and that is within our suggested guidelines.

I suspect your acid additions will become even less frequent in time but, even if not, you have it under control.

Next time you add, use Poolmath to correct it down to 7.5 if you like but I suspect you will find it wants to come back up to 7.7 rather quickly and then the rise will slow down.

I doubt the sun or shade has any affect but the colder temps probably do. In any case, you have a nice grasp on controlling it and I think you are good to go.
 
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