During a primary winterization water is shut off and water meter/main zip tied off to ensure it is not turned back on, preventing damage to plumbing after winterization is performed. Lines are blown out with compressed air, removing all water from plumbing system.   -50 degree non-toxic antifreeze is installed in all drains and toilets, water heater is drained toilets taped shut and plastic wrapped.  We also install winterization stickers to prevent anyone from breeching the winterization.