Lowering CYA

[Sallie]

My pool holds 25,000 gallons. How much water would I need to displace to get it from 100 to 75 or 80?

 

[YippeeSkippy]

If you wanted to get down to 75ish, it would take aprox one quarter drain and refill.

 

[YippeeSkippy]

BUT!....that's assuming your CYA is truly at 100. Did you perform a dilution test to determine that? That's where you mix equal parts pool water and tap water, mix well, and use that as your pool sample. Double your result for a high CYA level.

Maddie