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Old 01-06-2015, 10:53 PM   #1
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De-winterizing on the road.

Like many northern snowbirds we will be leaving for south into below freezing temps. After one day of deriving we expect to be below the freeze line.

What is the best way to sanitize the water system when in a campsite the first night?
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Old 01-06-2015, 11:47 PM   #2
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Fill the tank about 3/4 full

Dilute 1/4 cup of household bleach for each 15 gallons of tank capacity in to a gallon of water.
Add the chlorine/water solution to the water tank. (Never pour straight bleach into the RV fresh water tank. )
Top off the tank.

One faucet at a time, let the chlorinated water run through them for one or two minutes. You should be able to smell the chlorine. (Make sure you are using the water pump and not an external water supply.)
Top off the RV fresh water tank and let stand for at least three hours over night is better.
Completely drain the system by flushing the faucets for several minutes each. Open the fresh water tank drain valve to speed up emptying the tank.and Open the hot water tank drain plug and drain until it is empty.
Close all valves and faucets and drain plugs.
Fill water tank with fresh water.
Flush each faucet for several minutes each. (Make sure you are using the water pump and not an external water supply.)



Turn off pump and drain system again including the hot water heater.


Refill with fresh water and you should be good to go.
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Old 01-07-2015, 09:56 PM   #3
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Brian offered good information. I would add, for the flushing after sanitizing, add some baking soda (~1/4 cup), to remove aftertaste of RV anti-freeze, to the flushing water.
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Old 01-08-2015, 06:00 PM   #4
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Brian offered good information. I would add, for the flushing after sanitizing, add some baking soda (~1/4 cup), to remove aftertaste of RV anti-freeze, to the flushing water.

^^^^ This is precisely why, especially since I winterize / de-winterize several times per winter, I use air not pink stuff to freeze-proof my rig.

My de-winterizing involves adding water. Period.
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Old 01-08-2015, 06:33 PM   #5
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^^^^ This is precisely why, especially since I winterize / de-winterize several times per winter, I use air not pink stuff to freeze-proof my rig.

My de-winterizing involves adding water. Period.
Murf, I wondered how effective this would be. Do you just hook up an air compressor to the water fill, set at say 40 lbs? Then open all the valves one by one till all the water blows out of each?
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Old 01-08-2015, 06:43 PM   #6
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Murf, I wondered how effective this would be. Do you just hook up an air compressor to the water fill, set at say 40 lbs? Then open all the valves one by one till all the water blows out of each?
The RV geeks have a video showing how to winterize with air. I have not tried it, but plan to.


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Old 01-09-2015, 12:06 PM   #7
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I too use air rather than pink to winterize my lines. However each spring I still want to sanitize my water tank and lines before drinking the water out of them.
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Old 01-09-2015, 07:35 PM   #8
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Murf, I wondered how effective this would be. Do you just hook up an air compressor to the water fill, set at say 40 lbs? Then open all the valves one by one till all the water blows out of each?

Yes, BUT, let me first emphasize that the pressure of the air alone means nothing compared to the VOLUME of air at a given pressure.

I run a regulated air supply at 50 psi off a compressor big enough to maintain that pressure with at least one tap open continuously.

I hook it up to the city water inlet (not the tank fill port) and then open the various outlets starting with the one furthest from the inlet and let each run till there's no more mist coming out, just air. After each outlet has been drained like that I start all over again with each outlet including the toilet.

When the system is drained like this there is no need for pink stuff, nor sanitizing again before use.
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Old 01-09-2015, 07:38 PM   #9
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The RV geeks have a video showing how to winterize with air. I have not tried it, but plan to.


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Old 01-09-2015, 07:43 PM   #10
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Yes, BUT, let me first emphasize that the pressure of the air alone means nothing compared to the VOLUME of air at a given pressure.

I run a regulated air supply at 50 psi off a compressor big enough to maintain that pressure with at least one tap open continuously.

I hook it up to the city water inlet (not the tank fill port) and then open the various outlets starting with the one furthest from the inlet and let each run till there's no more mist coming out, just air. After each outlet has been drained like that I start all over again with each outlet including the toilet.

When the system is drained like this there is no need for pink stuff, nor sanitizing again before use.
Ditto ! When I reach my Southern destination I just plug in the water and let the air in the lines clean out and fill the Hot Water Heater-- takes about 15 min. Done ! No Pinky Stuff for My Horse !
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Old 01-09-2015, 08:04 PM   #11
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Blowing out the water with air is great for many rvs. My MH has an aqua-hot and the manual warns that blowing out with air is not adequate. It must be winterized with pink stuff.
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Old 01-09-2015, 10:12 PM   #12
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I have heard a lot of varying opinions regarding the effectiveness of winterizing with air alone. How do I know what is really valid? I am living in Colorado now with sustained temps below 0. Thoughts or comments?
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Old 01-10-2015, 06:23 AM   #13
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I have done the compressed air thing before on an Airstream TT I had. I used a 5HP compressor attached to a 30 gallon tank with the line regulated to 45 PSI and connected to the inlet water supply line for a water hose. I went from faucet to faucet then stool and shower until I thought I had all water out of all the lines. This is quite a time consuming process. Next spring i de-winterize and add water to find I have leaks under the floor between the stool and shower. I spend my camping weekend tearing out the stool (Luckily not the shower) and the floor it sat on to repair the burst water line. It was just a little droop in the line where enough water collected in the lowest part of the line to freeze it. I know people have used this method successfully many times but I have not. I got to do that all over again on my fifth wheel when I got it. Way too much work for that method for me. I use the pink stuff after using the air. I have to have it for the drains anyway. I am thinking this next winter I will just take it to a good shop and not worry about it. I know, shops freeze lines too but they are younger and better equipped to fix it than I am. That is my opinion and worth every penny it cost you. Lol! 😄


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Old 01-10-2015, 07:00 AM   #14
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De-winterizing on the road.

I blow the lines out with air. Then go with the pink rv antifreeze. We have a W/D and I don't know how to blow it out so I run a cycle of pink thru it. By using the air I use less pink I think ??
As to sanitizing I've never done that. We carry bottled water for cooking & drinking.

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