We have Toto Guinevere toilets in our new Wisconsin vacation home. We have well water and use a water softener. We keep the heat set at 60 but were going to drain the pipes and shut off the water for the winter to eliminate pipes possibly bursting. Will this cause any damage to the toilets? In my older vacation home, we would get hard rust stains in the toilets which were very hard to remove. Don't know if this will happen in this house. With the sani-finish I don't know if that would be a problem if it did happen.