Little Low CYA

I would put the amount of CYA powder needed to raise your level by 10 ppm in a sock and hand in the pool. If you have a skimmer put the sock in that .

Your other option, depending on how your pH and TA act, is to use a floater and trichlor pucks to add FC and CYA simultaneously. Use Effects of Adding Chemicals in Poolmath to see the effect of each puck.
 
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