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Old 10-12-2017, 11:50 AM   #1
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Exclamation Lowering Freeze Point in Black & Gray Tanks

Has anyone any suggestions for lowering the freeze point in the gray and black tanks, (protective winterizing between dumps)?

We are wintering in Washington and expect some very cold days ahead.

Thanks.
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Old 10-12-2017, 12:02 PM   #2
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How cold is "very cold"? For some that would mean 25 deg for others -25deg. If the temps are not to get below 20deg nor stay there for very long you could use windshield washer anti freeze for flushing to help protect the black tank. Adding anti freeze to the grey tank does not seem like it would to a lot of good as it would take a lot of anti freeze to not get over diluted and allow freezing anyway.

If you will have full hookups avaialable just leave the grey open and use it as normal.

The best thing would be to dump every evening.
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Old 10-12-2017, 12:06 PM   #3
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Does your RV have heated tanks or underbelly? (Not trying to be smart about it, but most RV's sold in that part of the world come with tank/plumbing heaters.)
If so just turn on the heaters or run the furnace a little more than normal.

If neither of those are possible just pour a gallon of RV antifreeze in the tanks.
The best thing would be to go ahead and dump and then add the antifreeze. That way it's also protecting the lines.
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Old 10-12-2017, 02:54 PM   #4
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Post Lowering Freeze Point in Black & Gray Tanks

The temp we are to expect could be below freezing for varying amounts of time.

Last year, so I am told, went to -20 F.

We do have the 'Arctic Pack' and wonder if it is a good Idea to have empty tanks during the coldest segments with the tank heaters on?

RV Antifreeze would be quite expensive over several months and I am wondering if there is anything else, (we use fabric softener in both the black and Gray tanks), that would lower the freezing point?
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Old 10-12-2017, 03:22 PM   #5
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Where the heck in Washington state are you going to see -20f other then on top of a mountain
I lved in wester washinto for 8 years and it her then the Mountains saw snow 1 time

My after lives in easter Washington his well pump is in an un insulated shed

Honestly look for a lower elevation near by or put straw bales around and heat the underside
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Old 10-12-2017, 03:28 PM   #6
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Originally Posted by Jmkjr72 View Post
Where the heck in Washington state are you going to see -20f other then on top of a mountain
I lved in wester washinto for 8 years and it her then the Mountains saw snow 1 time

My after lives in easter Washington his well pump is in an un insulated shed

Honestly look for a lower elevation near by or put straw bales around and heat the underside
I was stationed at Ft. Lewis WA. for 2 years and at that time I don't ever remember it getting below 30 and if it did it was not for very long, they get wet cold winters like Germany.
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Old 10-12-2017, 03:35 PM   #7
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Originally Posted by Jmkjr72 View Post
Where the heck in Washington state are you going to see -20f other then on top of a mountain
I lved in wester washinto for 8 years and it her then the Mountains saw snow 1 time

My after lives in easter Washington his well pump is in an un insulated shed

Honestly look for a lower elevation near by or put straw bales around and heat the underside
Ellensburg, and the temp was most probably caused by wind chill which we do have lost of wind.

It won't really matter as below freezing is still below freezing.
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Old 10-12-2017, 03:42 PM   #8
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Some porta-poti companies in very cold areas add water conditioner salt to the holding tanks to lower the freezing point. Inexpensive and easy to obtain.
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Old 10-12-2017, 04:03 PM   #9
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We do have the 'Arctic Pack' and wonder if it is a good Idea to have empty tanks during the coldest segments with the tank heaters on?
You do not want to run the tank heaters (Arctic Pack) with empty tanks. But since you have tank heaters just make sure you have 5-10 gallons in them and turn on the heaters. That is what they are for. Nothing else required to lower the freezing point since you will heat them above freezing.
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Old 10-12-2017, 04:03 PM   #10
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So you are talking about a near record low for that area normal lows are not much below 20 deg

Wind chill can be just as bad because it will cool an exposed pipe down to the ambient air temp faster then no windchill it wont make it any colder just reach that temp faster

Yes here in that he midwest where we do see many subzero days back that he back they do put salt I. Porta johns. But againg just like rv antifreeze it will need that hero be asntifreezedded every time you drain.

The best bet is to put some sort of skirt around and heat under.straw is your best bang and unlike hay has no neutrcional value so it attracts less pests
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