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Thanks for commenting on this and bringing up the discussion again. I didn’t see this before, but have now.  While watching the Texas deep freeze on the news, I didn’t once think to pour antifreeze into the plumbing. Horrible for the environment (sorry fishies) but if that’s what I need to do to keep my pipes from bursting and flooding my house…. Pouring alcohol in your toilet tank is less effective but another possible solution to lower the freezing point. So that idea is going to go into the back of my prepping brain for future reference for a worst case scenario. As for an answer to your question, it depends. You’ll find two types of antifreeze bottles at your auto parts store. 50/50 prediluted and then the concentrated version. When the ratios are properly mixed, they will protect up to temperatures like -34 to -84 degrees F (check your bottle for specifics). Lets say your toilet tank holds 1 gallon of water, if you mixed in 1/2 gallon of concentrated antifreeze and 1/2 gallon of toilet water you will get more or less the rating on the bottle. The prediluted kind already has water in it so adding it to the toilet water will dilute it even more and not give you as much protection. You really don’t need -84 degree protection though, so I would guess that even a cup or two would give you enough protection to prevent your toilet tank from bursting or freezing solid. I’d probably just start there and keep an eye on things, if it starts getting like a slushy or there is a thin layer of ice on the top, then add a bit more. Other strategies like slowly letting your pipes drip, opening cupboard doors under your sink to expose them to warm air, and keeping the house warm by fire or generator are things you should strive for first before pouring antifreeze into your pipes, but it’s a good tip to know for the extreme. 


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Thanks for commenting on this and bringing up the discussion again. I didn’t see this before, but have now.  While watching the Texas deep freeze on the news, I didn’t once think to pour antifreeze into the plumbing. Horrible for the environment (sorry fishies) but if that’s what I need to do to keep my pipes from bursting and flooding my house…. Pouring alcohol in your toilet tank is less effective but another possible solution to lower the freezing point. So that idea is going to go into the back of my prepping brain for future reference for a worst case scenario. As for an answer to your question, it depends. You’ll find two types of antifreeze bottles at your auto parts store. 50/50 prediluted and then the concentrated version. When the ratios are properly mixed, they will protect up to temperatures like -34 to -84 degrees F (check your bottle for specifics). Lets say your toilet tank holds 1 gallon of water, if you mixed in 1/2 gallon of concentrated antifreeze and 1/2 gallon of toilet water you will get more or less the rating on the bottle. The prediluted kind already has water in it so adding it to the toilet water will dilute it even more and not give you as much protection. You really don’t need -84 degree protection though, so I would guess that even a cup or two would give you enough protection to prevent your toilet tank from bursting or freezing solid. I’d probably just start there and keep an eye on things, if it starts getting like a slushy or there is a thin layer of ice on the top, then add a bit more. Other strategies like slowly letting your pipes drip, opening cupboard doors under your sink to expose them to warm air, and keeping the house warm by fire or generator are things you should strive for first before pouring antifreeze into your pipes, but it’s a good tip to know for the extreme. 


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