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Old 11-03-2016, 11:37 AM   #1
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Evidence on total flushing black tank for winter?

Our motorhome is back in storage for the winter. We dumped the tanks at our last overnight, but did use the toilet for the last day. I winterized the RV the day we returned and we parked it in the storage lot in the suburbs.

Is there any evidence that the black tank needs to be power flushed and completely empty for November to March storage?

A nearby RV dealer will do the job for about $100. But I can't see how having a a few inches inches of waste water and liquefied "stuff" sitting in in the bottom of a tank for the winter is going to dry out and do any damage.

Have any of you left the tanks nearly empty in storage and had a problem from doing so?
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Old 11-03-2016, 11:39 AM   #2
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If you have liquid and "stuff" in the tank and don't want to dump and flush, I would put some antifreeze in the tank and forget about it.
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Old 11-03-2016, 01:08 PM   #3
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If you have liquid and "stuff" in the tank and don't want to dump and flush, I would put some antifreeze in the tank and forget about it.
Yes..the issue is if it drys up and/or can freeze. Couple/three gallons of RVA should solve the problem.
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Old 11-03-2016, 01:29 PM   #4
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Originally Posted by Minnesota51 View Post
Our motorhome is back in storage for the winter. We dumped the tanks at our last overnight, but did use the toilet for the last day. I winterized the RV the day we returned and we parked it in the storage lot in the suburbs.
Is there any evidence that the black tank needs to be power flushed and completely empty for November to March storage?
Have any of you left the tanks nearly empty in storage and had a problem from doing so?
Quote:
Originally Posted by dons2346 View Post
If you have liquid and "stuff" in the tank and don't want to dump and flush, I would put some antifreeze in the tank and forget about it.
Minnesota51
I have not always "completely drained" the waste tanks for winter storage in Wisconsin.
But I do pour 1/2 gallon of RV antifreeze into each waste tank when I winterize.
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Old 11-03-2016, 01:36 PM   #5
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I always thought the danger of freezing was that ice expands and breaks things if it is confined. In an almost empty black or grey tank it can freeze with plenty of room to expand, I would think.

I can easily add some pink stuff. Just wondering how that helps keep things from breaking. I know the pink stuff can evaporate as water does.
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Old 11-03-2016, 01:46 PM   #6
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You are correct about freezing and expansion but I think you have pipe connected to those tanks that may benefit from some antifreeze in them. Couple gallons of
antifreeze = inexpensive insurance.

Just my $0.02 keep the change.
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Old 11-03-2016, 01:48 PM   #7
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You are correct about freezing and expansion but I think you have pipe connected to those tanks that may benefit from some antifreeze in them. Couple gallons of
antifreeze = inexpensive insurance.

Just my $0.02 keep the change.
I see. Makes sense. I do not know all the configuration and piping to the output valves.
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Old 11-03-2016, 01:50 PM   #8
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You wouldn't want to have your black tank valve freeze up, expand and break once it thaws out, would you?

Dump in the cheap stuff and don't worry about it!

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Old 11-03-2016, 01:54 PM   #9
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I see. Makes sense. I do not know all the configuration and piping to the output valves.
I don't know the configuration on your tanks either but they all (most) work by gravity and the dump connections are at the low point in the system and that plastic can crack in a hard freeze.

There are many on here that just drain their systems the best they can and have no issues at all. Some just use compressed air and have no issues at all. I am just not that darn lucky so I drain, blow out and add the pink stuff.
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Old 11-03-2016, 01:55 PM   #10
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I always thought the danger of freezing was that ice expands and breaks things if it is confined. In an almost empty black or grey tank it can freeze with plenty of room to expand, I would think.

I can easily add some pink stuff. Just wondering how that helps keep things from breaking. I know the pink stuff can evaporate as water does.
I would only worry about the freezing at the exit valve. Antifreeze would mitigate any potential damage. Having to replace a leaking valve would not be a pleasant task.
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Old 11-03-2016, 02:00 PM   #11
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There are many on here that just drain their systems the best they can and have no issues at all. Some just use compressed air and have no issues at all. I am just not that darn lucky so I drain, blow out and add the pink stuff.
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IMO there's nothing wrong with "an abundance of caution"... (aka: "overkill").
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Old 11-03-2016, 02:10 PM   #12
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While I don't oppose overkill I also don't like spending money. ;-)

Assuming you mean a few flushes we have done what you did most winters with no ill effects.

I agree that there is a good chance anything freezing in the bottom could probably expand upward into that big flat tank. If I was worried I'd dump into a 5 gal bucket and then dump the bucket into a proper place.

That said I expect that by the time I run pink stuff out of the faucet for a bit to make sure there the trap is filled there is also runoff into the various tanks. That helps with protection. If I was still worried there I would dump a gallon or two of windshield washer deicer down the drains. Half or less the price and adequate for the task.
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Old 11-03-2016, 03:00 PM   #13
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You wouldn't want to have your black tank valve freeze up, expand and break once it thaws out, would you?
I think this is what may are missing. Any liquid entering the tank is going to seek the lowest point which will be the dump valve and the associated piping. The other unknown is even if you add RV antifreeze will it mix with what is behind valve and in the pipe without some type of agitation. My thoughts are you need to pull the rig out of storage and completely empty the tank(s).
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Old 11-03-2016, 03:02 PM   #14
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You wouldn't want to have your black tank valve freeze up, expand and break once it thaws out, would you?
I think this is what may are missing. Any liquid entering the tank is going to seek the lowest point which will be the dump valve and the associated piping. The other unknown is even if you add RV antifreeze will it mix with what is behind valve and in the pipe without some type of agitation.

My thoughts are you need to pull the rig out of storage and completely empty the tank(s). Being located in Minnesota you might have a 2" diameter frozen solid poopsicle by Christmas.
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