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Old 10-03-2018, 10:31 AM   #1
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Water in holding tanks for winter

Should I empty my black water tank for winter in Canada? We put a few gallons in there with detergent on our last trip home to clean tank and forgot to dump it. Rest of coach is winterized.
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Old 10-03-2018, 10:38 AM   #2
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Well, I don't worry about it because our winters are mild here and my wet bay us heated. All the valves and Sanicon are inside the bay too.
One thing you don't want is the contents of the tank to evaporate and leave the solids behind. I think I'd pour some antifreeze down the toilet making sure it gets to the outlet valve.
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Old 10-03-2018, 10:48 AM   #3
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Hey BCRver, I would definitely dump the black tank and winterize it as well. It's not worth risking the damage that could and probably will occur if you get freezing temps in winter.
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Old 10-03-2018, 10:48 AM   #4
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I would strongly suggest that you dump your tanks at least. If it freezes and breaks your tank you're going to face a big mess and a large bill. Very high risk and extremely low benefit.
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Old 10-03-2018, 10:53 AM   #5
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I live in my trailer full time, and if I have liquid in my sewage tanks I add some cheap RV antifreeze to the tanks if the daytime temps don't come a decent bit above freezing during the day. It won't keep them from freezing, but it might help keep them from freezing solid, like the difference between slushy ice and a block of ice. My "basement" is warmed by the furnace, but the antifreeze is a little extra I do if the daytime temps will not come above freezing. This plan got me through a long sub-freezing stretch in Eastern Idaho during the winter of 16-17
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Old 10-03-2018, 02:48 PM   #6
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I would definitely dump it. If it's truly only a few gallons I would do it with a bucket, but more I would go to a dump station like a local park.
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Old 10-03-2018, 06:09 PM   #7
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ya...should be fairly clean I will dump for piece of mind
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Old 10-04-2018, 05:37 PM   #8
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A little water freezing in the tank would not be an issue. However, water freezing in the pipe between the tank and the dump valve is a big issue. Dump it and add a quart/liter of the pink stuff for insurance.
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Old 10-04-2018, 06:10 PM   #9
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Dump the tanks for sure , then dump the pink stuff down each drain to make sure the traps are filled.A small amount of water will not hurt the tank , but could easily split the pipes and valves when it freezes.
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Old 10-04-2018, 07:38 PM   #10
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Quote:
Originally Posted by ernieh View Post
A little water freezing in the tank would not be an issue. However, water freezing in the pipe between the tank and the dump valve is a big issue. Dump it and add a quart/liter of the pink stuff for insurance.
I have seen valves that have split because people emptied the tank, but the bit of water left due to rv not being perfectly level when dumping or whatever the reason is, has ran to the valve and froze. I dump at least a half a gallon in each tank to protect the valves.
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Old 10-04-2018, 10:37 PM   #11
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Quote:
Originally Posted by ernieh View Post
A little water freezing in the tank would not be an issue. However, water freezing in the pipe between the tank and the dump valve is a big issue. Dump it and add a quart/liter of the pink stuff for insurance.


Been there, done that, luckily gray tank. Also had gray line freeze and crack once on rig while in use. It had the valves located in non heated belly of a non 4 seasons trailer.
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