Best alternative to RV antifreeze.
We're trying to get an early start heading out west this year in April. We're going the South route out and North route back so we will experience some freezing snowy weather for sure. A mix of 50/50 ...
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Are we not understanding the question? RV antifreeze is intended to displace water in DOMESTIC water lines. It WILL "freeze", or at least "slush up". The difference is the glycol stuff will not expand, which is the issue with water, which is what causes the damage to water lines. The OP is asking about holding tanks, not domestic supply lines. The glycol antifreeze says NOT to mix with water - remember its purpose is to displace water, not mix with it... Propylene glycol has the same specific gravity as water, so it will not "settle" to the bottom of holding tanks. Pretty much add tank heater pads (12V, not 120V so they can be used while travelling) and dump often. You can always add a Porta-Potti in the shower for use in cold weather - easy to dump in any restroom. ST
