I've recently moved into a house that a friend inherited and the pool has a swg system already installed. The pool guy inexplicably started using liquid chlorine in the pool and shut off the swg system. So the pool has been lc for over a year now. We want to revert it back to using the swg and have a question:
1. Do we need to empty the pool and refill it before turning the swg back on?
Is there anything else we should do?