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Old 12-11-2018, 03:12 PM   #1
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Antifreeze Slush - Need help, advise, comments good or bad

We just had a 5 degree night here in central New Hampshire. When I went in to inspect the camper the antifreeze in the toilet was slush.

In winterizing the camper I did what the directions called for. Blow out all water lines. I did this several times at 30PSI until nothing came out of all openings hot, cold, inside and out. Made sure the water pump pumped out any water, emptied the water filter. I then poured two gallons down the sink, shower and toilet drains.

So why would the antifreeze be slush?

What should I do about it as we can expect well below zero temps in Jan and Feb?
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Old 12-11-2018, 03:15 PM   #2
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That is what RV antifreeze does. It doesn't freeze solid like Ice, but will turn to a slush that will not harm your pipes, valves fittings...etc...
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Old 12-11-2018, 03:16 PM   #3
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Happens to me every year. Nothing to worry about.
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Old 12-11-2018, 03:18 PM   #4
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Thanks, Guess I'm showing that I'm new bee to winterizing and having a camper needing winterizing.
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Old 12-11-2018, 03:35 PM   #5
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Standard early winter question / concern. The damage is caused by expansion of the freezing liquid. RV antifreeze will turn to slush but not freeze solid and expand until it gets to about -50F.
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Old 12-11-2018, 03:44 PM   #6
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Thanks all for your help. Fortunately it doesn't get to -50F here but I have seen -20F.
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Old 12-11-2018, 04:45 PM   #7
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Even when it becomes more solid, it barely expands.
Unlike water that expands when frozen and can burst plumbing, fittings and faucets, R/V antifreeze does so very minimally and then only if part of it's make-up is H2o.
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Old 12-11-2018, 04:48 PM   #8
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I have used the rv antifreeze and have had minus 20 or so and all ok. I still buy the -50 degree type and now some of the minus-75 is available. If there would be a little water left in something, then I think the -75 would give a little more protection. I also pour some in my underground sprinkler system when winterizing that.
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Old 12-11-2018, 05:06 PM   #9
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Quote:
Originally Posted by 5picker View Post
Even when it becomes more solid, it barely expands.
Unlike water that expands when frozen and can burst plumbing, fittings and faucets, R/V antifreeze does so very minimally and then only if part of it's make-up is H2o.
That's funny since most all rv antifreeze is over 50% water to begin with
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Old 12-12-2018, 02:03 PM   #10
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Slush is fine... All you are wanting is to keep straight water from freezing solid and expanding so much when confined that it pops, breaks or blows out everything where confined.
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