Hi, Jim,
I think I would disregard the pie plate as a source for your water issues.
It sounds like you are at the end of the clearing process. I have read several posts where the cloudy condition after clearing algae persists for a day or two even tho the test for CC's is negative.
I know from your post that you are already doing this but, as reinforcement, run your pump 24/7, vacuum and brush frequently, backwash as necessary, and, most importantly, keep your chlorine all the way up at that 15ppm level until your water is back to crystal....it won't take too much longer.
Sounds like it's fine to swim in....enjoy.
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