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.
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