Originally Posted by BobR
Question: how much dilution is ok since there may have been a couple gallons of water left in the tank before dumping in the 5-gal of AF and pumping thru all lines. Am I ok for Kansas' zero-degree temps?
There is no clear answer here because there is no way to know exactly how much water was left in the tank when you added the antifreeze.
I think the "thingy" (the proper name escapes me) that is used to test specific gravity of radiator antifreeze may also work in this circumstance. You might be able to get some answer there.
But, there is also the possibility that the antifreeze did not evenly mix with the water, and there will be liquid of greater or lesser protection capability in different parts of the water system.
I have an old piece of shower hose with the connector left on one end which has the same thread as the input on the water pump. So, after I have drained the fresh water tank and blown out the rest of the water system, I disconnect the feed line from the tank to the pump, and replace it with my poor man's siphon line.
I just did this yesterday, and it only took 1.5 gallons to do the whole trailer.
One other hint, I use a shop-vac to blow out all the S-traps right after I blow out the water lines. That way, I don't have to worry about running enough antifreeze into the traps to replace the water in them. Cuts way back on the amount of antifreeze needed.
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