Agreed, eliminating crypto in a typical residential pool is basically impossible. If I were sure I had a pool infected with it, I'd probably drain, disinfect a

Agreed, eliminating crypto in a typical residential pool is basically impossible. If I were sure I had a pool infected with it, I'd probably drain, disinfect as much as possible, refill, and then SLAM the pool hard with no CYA for a while. What a PITA. And that assumes the pool is the type that can be drained. The most reliable solution, of course, is to screen the people who are going to use your pool and don't allow anyone who has even a hint of crypto symptoms to get in. I hope that most public pools invest in a UV system. It's hard to prevent some dumbass with diarrhea from deciding today was a good day to swim anyway. Lots of those types of people in the world.