Hello! Starting with a fresh fill following a waterline retile in October 2019. Pool was filled but not treated, then closed. Reopened today. Typically I start in the spring with a pool that just needs a SLAM and a little tweaking, then I'm good for the summer. However, this time I'm starting with some numbers I'm not as accustomed to fixing.
I'm testing with a fresh TF100 test kit. 30000 gal plaster pool, SWG (SWG off now)
My tap water: pH 7.5, TA 320, CH 60
Pool company added: 10# pH down, 4x1gal 12% Cl, 6# CYA, 7x40# bags salt.
Water circulated 6 hours, then I tested:
Cl 11.5, cc .5, pH 7.8, TA 270, CH 70, salt 1200, CYA 15 (estimate) water looks quite clear. water temp 58
questions:
1. I'm worried about the CH being so low, but I'm pretty sure SLAM and TA need doing before I address the CH. Particularly because I think (?) calcium can precipitate out if you add it when TA is so high? Do I need to worry about that?
2. Is my plan for bringing this all in line correct?
plan:
- let Chlorine drift down below 10 so I can get an accurate pH
-lower pH with MA to 7.4, aerate back up to 7.8, repeat until TA reasonable (?150)
-get CYA to 30
-SLAM
-get CYA & Cl set for the season
-add calcium hardness increaser, 1/3 at a time, to get CH to 250
-adjust salt for swg
3. does the water flow through the return jets to the pool add enough aeration to increase the pH? I don't have a fountain or other water feature to aerate the pool. I haven't had such a high TA in years so I've forgotten how to lower it.
Sorry if I've left out any details. TIA for the help
I'm testing with a fresh TF100 test kit. 30000 gal plaster pool, SWG (SWG off now)
My tap water: pH 7.5, TA 320, CH 60
Pool company added: 10# pH down, 4x1gal 12% Cl, 6# CYA, 7x40# bags salt.
Water circulated 6 hours, then I tested:
Cl 11.5, cc .5, pH 7.8, TA 270, CH 70, salt 1200, CYA 15 (estimate) water looks quite clear. water temp 58
questions:
1. I'm worried about the CH being so low, but I'm pretty sure SLAM and TA need doing before I address the CH. Particularly because I think (?) calcium can precipitate out if you add it when TA is so high? Do I need to worry about that?
2. Is my plan for bringing this all in line correct?
plan:
- let Chlorine drift down below 10 so I can get an accurate pH
-lower pH with MA to 7.4, aerate back up to 7.8, repeat until TA reasonable (?150)
-get CYA to 30
-SLAM
-get CYA & Cl set for the season
-add calcium hardness increaser, 1/3 at a time, to get CH to 250
-adjust salt for swg
3. does the water flow through the return jets to the pool add enough aeration to increase the pH? I don't have a fountain or other water feature to aerate the pool. I haven't had such a high TA in years so I've forgotten how to lower it.
Sorry if I've left out any details. TIA for the help