Split off of this topic. Jason Lion
I read your problem regarding your ph rising I will answer this question to the best of my ability.
Ph will rise if you use powder chorine if you use chorine pucks it will lower ph. Weather temperature will affect ph with rain will dilute some but not a lot with a perfectly balanced pool.
Every time you use chorine this hill happen no matter how perfect your water balance. In hot months more acid because you use more chorine.
I would recommend using 1 type of chorine powder your Ta ideal is between 100 to 120
chorine pucks 80 to 100 ideal as for your chorine I would keep at 2 ppm to 3ppm no more no less if you use powder chorine you have more control you can test add 2 ounces of chorine on a ten k pool 1ppm if water is perfectly balanced I know it sounds strange but true. people tend to over treat their pool and cause damage all self inflicted. we always tend to give more then less human nature.Ideal ph is 7.6 to 7.4 remember this is a level that needs to be checked every 2 days to insure an ideal ideal ph period no way out if you want to have ideal ideal pool setting you have to test and test or if you want to have a balanced pool 7.2 to 7.8 test 2 times a week.
I hope I shed some light.