I am in the process of selling my hot tub to a close friend, but they will not be able to take it for 2 months (patio being built). I would like to shut it off and drain it for the next 2 months until he's ready for it, but am not sure if that will mess things up for him in the future. Does anyone drain theirs and shut it off for extended periods of time (summer for example) and what should I consider if I do that? Just looking for some general advice here. Thanks!