We're going away for 3 weeks and our hot tub won't be maintained. We can't drain it as our temps are below freezing here, so we need to keep some warm water circulating throught the plumbing to prevent damage. How low would you say is acceptable to keep the water temp?? And would you dump a bunch of chlorine in before you left, or is that hard on the equipment? (We already know that when we get home, it'll require a complete drain and clean out, just not sure if it's better for the hot tub to attempt to maintain some chlorine in it)