Can I use regular automotive antifreeze in the black and gray water tanks and sink traps or must I use the RV antifreeze?  I am in NE AR and only blow out the lines to winterize the water lines in our MH.

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Wouldn't that be a bunch more costly not to mention the possibility of poisoning a pet or a neighbors pet. Just saying!

so are frozen/broken pipes.  I have not been able to locate any un-diluted pink RV antifreeze that I used to get to winterize our TTS.  I am worried that this pre-diluted junk is not going to be strong enough when added to the water already in my P traps to keep them from freezing.

OK, RV antifreeze has changed since the last time I looked at it.  I bought some from Walmart and I see it is good to -50 degrees.  Last time I looked is was only -10 or -20 degrees and mostly water.  I feel better about using it.  Thanks all for your input.

The RV antifreeze you see in places like Walmart and Home Depot ARE diluted. That minus 50 rating is only when used in pure strength. Mix it 50/50 and it will freeze at 10 degrees above F. Keeping it pure strength is not always possible with plumbing.   You dump some in a trap that has water in it, and unless you dump in an awful lot of antifreeze - it gets diluted and will freeze at a higher temp. Same if you run some in your lines and there's some trapped water in there.  Auto antifreeze can be mixed with 40% water and be good to 50 below 0 F.  Try that with that so-called "minus 50" stuff and your pipes will freeze.

 The better RV antifreeze is rated to 100 below in pure strength.  That's what a plumber or heating tech will use when filling heating pipes in a house with hot-water heat. Non-toxic and $12 per gallon.  Hercules Cryo-tek-100,  Camco 35116 Boiler Antifreeze, No-Freeze concentrate, etc.  Mix it 50/50 with water and it's good to 30 below F.

So, if I understand you correctly, I was right in my thinking to go with automotive antifreeze in the p-traps and holding tanks instead of the RV antifreeze as I cannot locate the -100 degree stuff I used to use.

As far as freeze-protection, yes.  But automotive antifreeze is highly toxic.  Pretty much illegal to dump it down drains or on the ground.  That makes it not a great choice for protecting plumbing anywhere.

I'm not saying you need it - but if you want non-toxic antifreeze that is much stronger then that diluted so-called "-50" RV crap, there are many places to buy including Home Depot and any plumbing or building supply place.  Heating system or swimming pool anti-freeze. 2 to 3 times stronger then that watered-down "
-50" RV stuff that is only good to around 10 above F when mixed with water.

Camco swimming pool non-toxic anti-freeze is $11 per quart at Home Depot. Here's the description off the label:

"Concentrated formula saves on freight. This new Pool Antifreeze gives you great winter protection at a lower price. Our antifreeze is concentrated so 1 quart mixed with 3 quarts of water will make 1 gal. of antifreeze that will protect pool plumbing down to -40° F. Want even lower temperature protection. Add less water. Comes with a dilution chart, so you can make the strength you desire. We recommend -40° F to be safe. Concentrated antifreeze is totally safe for swimming pool use and non-toxic. Use one gal. for every 10 ft. of 1.5 in. pipe. Safe for all types of pool plumbing. 100% Propylene Glycol."

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Thank you for the clarification

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