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Old 02-09-2016, 07:21 PM   #1
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Winter use of cassette toilets

Will RV antifreeze protect toilet and water tank in cassette toilet system

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Old 02-09-2016, 07:33 PM   #2
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Depends on the temperature. Overnight at 30F you might be ok. Prolonged use below freezing probably not. Is this in a tent trailer?

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Old 02-10-2016, 05:37 AM   #3
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No I have a Northstar 9.5 igloo and I will be going from NH to Florida so it will take me a couple of days to get to warmer weather!
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Old 02-10-2016, 06:04 AM   #4
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Maybe you can wait until you're a few states South before using it? The rest of the plumbing is also at risk. Antifreeze (radiator) is incompatible with many types of rubber seals. Rv antifreeze would be ok. But why risk it? Once diluted things may ice up.
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Old 02-15-2016, 06:42 PM   #5
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I can't think of why it wouldn't work as there are many folks doing basically the same thing with their regular holding tanks by flushing the loo with RV anti-freeze.
Tom - KK8M -Warren, Michigan
MI Licensed Electrician, ISA Level 2 Certified I&C Tech, UL Certified PV Installer, Organic "Olla Irrigation" Gardener and bona fide Schlepper
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Old 02-16-2016, 06:48 AM   #6
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Thanks for help I have talked to dealer he says to use straight RV antifreeze
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Old 04-06-2017, 06:16 AM   #7
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I have a northstar laredo with casset. Used antifreeze. Usred when tempriture was down in the teens. Worked fine no proplems
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Old 04-19-2017, 10:03 AM   #8
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FWIW. . .
My RV dealer recommended using regular car window washer fluid in the Thetford cassette fresh water tank during winter camping.

The stuff is easy to find in any auto store or Walmart, etc...
Its cheap and supposedly wont deteriorate rubber/PVC/plastic.


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