Hi, thanks for welcoming me to this group. I purchased a new house with existing in ground gunite pool in January, 13280 gal. I’ve read pool care manuals, watched several videos, but I can’t solve this problem: I shock pool with cal hypo, chemistry is great, 3 days later pH and TA creep up, I add 31% muriatic acid to get pH 7.5 and TA 80. After 2 days pH is at 7.8 and TA is 120. If I don’t add more acid at 7.8, pH and TA will go higher. So I add more muriatic acid-volume based on poolmath app. I’m shocking once a week, adding 2 HTH 3 inch chlorine tabs once a week. I just don’t think I should have to add a quart of muriatic acid every 3 days. I’m using Leslie’s 7 in 1 strips. I have trouble deciding the pH with these, so I’m using Clorox pool 3 way liquid test kit for pH. I find the Clorox results for FC and pH are too similar at the different levels, but I’m able to get results in sunshine. My results:
After shock and muriatic acid:
CH 250
TC 5
FC 5
pH 7.2
TA 80
CYA 30-50
3 days later:
CH 250
TC 3
FC 3
pH 7.8
TA 120
CYA 30-50
All results are stable except pH and TA, which are consistently going up. I have a Jandy CV340 filter using 4 Fitpool cartridge filters 85 sq ft. Replaced them 2 weeks ago, run twice daily for 2 hours. Jandy FloPro pump. Also vacuum twice daily with Polaris 360 vacuum. Is my CH too low? Is this causing my problems? Any help is appreciated!
After shock and muriatic acid:
CH 250
TC 5
FC 5
pH 7.2
TA 80
CYA 30-50
3 days later:
CH 250
TC 3
FC 3
pH 7.8
TA 120
CYA 30-50
All results are stable except pH and TA, which are consistently going up. I have a Jandy CV340 filter using 4 Fitpool cartridge filters 85 sq ft. Replaced them 2 weeks ago, run twice daily for 2 hours. Jandy FloPro pump. Also vacuum twice daily with Polaris 360 vacuum. Is my CH too low? Is this causing my problems? Any help is appreciated!