Lowering CYA

[GAPOOL14]

Will draining 1/4 of my water twice have the same effect on lowering CYA as draining 1/2 of my water once. Don’t want to possibly effect the integrity of my pool walls by draining half of the water at one time as well as incurring a huge water bill.

 

[Phillbo]

I would think that logic makes sense.

 

[Richard320]

Close, but not quite.
100 CYA *.75 = 75 CYA
75 CYA * .75 = 56.25 CYA