New Pool, Went to the pool store! Help

[GraceByDesign]

The higher the CYA, the more stable your chlorine will be. ***

BUT

CYA reduces the effectiveness of the chlorine as a sanitizer. This means you have to keep a higher level of chlorine if you keep a higher CYA.

If you have a CYA of 200, I don't even know how much Cl you would need on a daily basis, maybe 8-15, but to shock would take a ton... at 60-90ppm CYA (the highest level on Ben's chart) shock level is 20. Higher that 20 is not recommended for vinyl pools because of potential bleaching of your liner. And while swimmimg in a highly chlorinated pool is probably ok once in a while, I personally would not want to make a habit out of swimmimg in it!!

30-50 seems to be a number that keeps the chlorine relatively stable to sunlight, while not requiring HUGE chlorine ppm's to keep your pool sanitized.

***ETA probably only true to a certain point. I am not a chem. whiz...