The pool and other facilities at our county recreation center used plenty of disinfectant even before this epidemic.
The other key feature is that the individual users need to follow good sanitation practices. It seems like the Israeli ladies would do that.
Getting into a Mikva is (from what I understand from movies) essentially the same as a baptism, although there is no preacher. Indeed, I believe the gentile practice is based on the Mikva.
It’s a solitary exercise by design.