Hi Nicole,
My inclination would be to raise the chlorine to shock level (25 ppm for your CYA of 100) whenever this happens and in general stay to the high side of your recommended FC range (which would be 15 ppm for your CYA of 100).
I have a 4-1/2 year old and although he doesn't poop in the pool (or he hasn't yet!) he will often get poop in his underwear because he doesn't get to the potty in time (often because he is too busy with whatever else he is doing) and like you, we ask if he has to go and he will say no but then three minutes later there he is in the bathroom with poop in the underwear again. The most effective treatment so far is we recently got a rewards chart (I think is was a Melissa & Doug magnetic board) and he could put a magnet up for every day he got to the bathroom in time. He did very well with this and after several successful days as a reward we took him to the Boston Children's Museum one Saturday on the train. Lately, we slacked off in specifying what the next reward would be and he seems to be sliding backward but it defintely gave him motivation to improve so I would say it's definitely worth trying. I don't know that there is one answer that works on every child so you might need to try different techniques to see what works best for your child. Good luck!
Peter
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