Dumping antifreeze into toilet really only freeze protects contents of black tank, not the toilet. The parts of the toilet vulnerable to freeze are the water valve, sprayer (if equipped) and the chambers and hoses connected between valve and bowl. The only way fresh water could get into those parts is if you turn on pump and flush antifreeze out of the plumbing lines. You could flush with a jug of plain water, then throw an ounce of antifreeze in the bowl after the flush valve closes to keep seal from freezing. Of course if you are moving about or traveling in the RV, probably interior temp is above 32º anyway so toilet isn't going to freeze.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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