Ugh.. well we have an intex 18x 52. My 4 year old Had a stomach bug and was throwing up this last week. My husband thought he was over it and took him swimming today against my advice. He ended up having a little bit of an accident in the pool of diarrhea. Do we need to drain the entire pool? Should we be worried about cryptosporidium? Prior to this happening chlorine was at a 7 cya at 60