some math because I'm curious: If you draw down and replace 50% of the water every day, each molecule has a 1/2 chance of sticking around. After 3 months that's

some math because I'm curious: If you draw down and replace 50% of the water every day, each molecule has a 1/2 chance of sticking around. After 3 months that's 1/(2^90). A 5 gallon pot contains around 2^87 water molecules. So after 3 months there's basically none of the original liquid left.