Stephanie,

If your husband drained the pool using the pool pump, it probably blew out all the undissolved stabilizer sitting in your filter.

Assuming your builder and you both introduced it thru the skimmer, CYA then sits in the filter and slowly dissoves. So whatever was sitting in there is probably gone.

Normally CYA dissoves over two-three days in my pool but others report up to a week. So whatever was put in over a week ago should be dissolved.

Test once more, then add enough to get you about 20ppm under your target level. If that comes out correct, then add enough to bring you up to your goal.