Yes, there is anti-freeze in caravan systems, but if you switch your system off over winter (to save gas) you will come back in spring to find the inside of the van covered in black mold and it takes hours to clean off (from experience). Over the next 2 weekends I shall be shutting down my vans, insides get a very good clean, hot and cold get blown out and antifreeze in all u-bends and toilet cysterns. I shall visit at least once a month to keep an eye on them, more often if weather dier.
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