The person my parents got their first RTB from bred all kinds of Boas including anacondas, and he put his anaconda in the pool atleast 3 times a week (they like to swim ya know) but i'm not sure if he put chemicals in it or not, I think the pool was specifically for the snake.

p.s. One time he couldn't catch it, dang they swim so fast!

dunno if that goes for BP's too though.