If your CYA is completely dissolved, and the pump has been running all night, then it's okay to go ahead and test your CYA. You'll need to have an idea of how high it is so you can adjust your chlorine levels accordingly. We do tell people sometimes it takes up to a week for it to register, but that's when it's added via skimmer and takes a week or so in the filter to dissolve and show up in the water. If yours was dissolved directly into the water, then you should be able to get an accurate level by later today.
Janet
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