I'm asking this for another person who has a concrete pool, and the pool stores have had her chasing her tail w/ chemistry. Sound familiar. LOL

What is a safe range for the levels of Ca for a concrete pool??? I know w/ the vinyl liner it is <500, but I couldn't find what it should be for a concrete pool. I tested this ladies water, and her Ca is 350.

What is the range for ALK for a concrete pool???? I know vinyl is 80-125, but what about a concrete pool??? This ladies ALK is 140.

Thanks for you help.

Blessings,