Ca and alk requirements for concrete pool

[waterbear]

Actually, the TA depends on the form of chlorine used. Stabilized chlorines (trichlor and dichlor) and bromine tabs are acidic and require a higher TA of about 120 -150 to keep the pH from 'crashing'.
Unstabilized chlorines (cal hypo, lithium, sodium hypo and bleach, and chlorine produced by a SWG are more pH neutral and maintain a more stable pH when the TA is much lower (80-100 ppm). Many pools that use these sources of chlorine actually benefit by lowering the TA even more to about 60 ppm! (Less outgassing of CO2 so less tendency for pH rise!)

CH of 350 is fine.

If she is using trichlor tabs then her TA is fine (but I would keep close tabs on her CYA levels!)

[TRHOD12]

Evan,

I've just got her to the point where she has stopped listening to the Pool store.

I haven't got a CYA level yet, cuz I ran out of my test solution, but I plan on that.

Right now, I have here adding enough bleach to take her chlorine level to 12-15ppm based on the bleach calc for her pool size at night. I want her to get me a sample early in the am, to see if the pool is holding chlorine over night(check to see if she if fighting algae or not). I will go from there.

thanks all for your continued help. I remember joining on here a couple of years ago, w/o a clue about pools. I never dreamed that someday I'd be trying to help someone else out. I owe it to the forum and the great people who help out daily on here. A big thanks to all.

BLessings,