It will reduce it by however much water you replace. If you replace 50% of the water, the CYA will drop by 50%. Be aware that CYA tests aren't very accurate above 100ppm, so yours may really be higher than 140.
Re: Cya ??
It will reduce it by however much water you replace. If you replace 50% of the water, the CYA will drop by 50%. Be aware that CYA tests aren't very accurate above 100ppm, so yours may really be higher than 140.
Re: Cya ??
It might reduce it by less than 50% since excess CYA can deposit in the plumbing and can redissolve when the levels drop. Fill the pool, wait about a week, and test it again. Then if you need to lower it more just do some partial drains and refills to get it where you want it.
Retired pool store and commercial pool maintenance guy.
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