knight500
Hello all, I hope you all had a good winter even tho I know that's not over yet for some of you 😃
We've shared some topics on here about winterizing and I appreciate the info as our 177SE is our first trailer and I'll be in the learning curve for quite a while yet.  
This winter I decided to use the non-toxic anti freeze in the water lines method of winterizing.  We're going on our first trip this year in a few days and I'm ready to de-winterize.  I'm reading the owners manual and it says, after flushing the system with fresh water, to "sanitize" the system.  But that's all it says.  Can someone help me with a "how to" on sanitizing the system.  Is there a product to buy and what method do I use?
Also, we're not too worried about the taste of our fresh water in the trailer right now as we don't drink any of it.  We don't use it for cooking either.  Just washing, showers and flushing.
Maybe next year I'll use the compressed air method for winterizing but for now I need to clear out the anti freeze in the water lines.

Thanks in advance for any help
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mikes
Flush the antifreeze with hose water using the city water inlet. After the pink and foam is gone from all faucets/toilet, switch the water heater bypass and fill that up (open outside shower hot if you have it, sink hot otherwise).

Use a funnel and put about 2/3 cup of cheap (non-scented) bleach into the water filler. Follow with 10 gallons of hose water (~1/4 tank).

Step 2. Turn on the pump and open the sink hot water faucet until you smell the bleach (it will belch a lot as air comes out). Open the shower hot faucet until you smell bleach. Open the sink cold until you smell bleach. Open the shower cold until you smell bleach. Flush the toilet. If you have an outside shower, open the faucets until you smell bleach (it won't take much). Everything is now full of bleach-water.

Let it sit for an hour or two.  Then open any faucet until the pump is sucking air.

Then flush out the bleach-water. Fill the tank half way with water, and go up to Step 2, except open the faucets in the reverse order, cold water first, and the outside shower hot second (less water into the gray tank, and most water ends up going through the hot water tank), and you're flushing until you don't smell bleach.  Then fill the tank half way and do it again. That should get rid of most of the chlorine smell and leave the system sanitized.

Done, except for emptying the gray water tank (the black will only have a couple of flushes in it).
Mike
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Merriman
mikes,  Thanks for the post. I believe that you answered knight500's question well.  I have been winterizing since the the late 90's for a large travel trailer and now my current park model and new 177SE.  I stopped distributing RV antifreeze long ago and limit its use to just the p-traps and toilet.  I never have sanitized, but I know a lot do.  My water quality has been very good.  I do use a Bria water filter container that I fill and keep in the refrigerator for drinking and coffee.  I am a microbiologist and really get the sanitization thing and will resort to that it I see symptoms of poor water quality.

I use compressed air to blow out the water for winterizing.  I am very methodical and blow the line dry.  So far so good.  Still I may try the bleach treatment next year.  I have never heard of water-borne illness due to contaminated RV water, but if the water has a smell (like rotten eggs?) then the bleach treatment would be solution, but doing this every year? I guess it depends on the each persons' comfort level and knowledge of the risk.
Bob Merriman
2017 Retro 177SE 
2015 Ford F150 2.7L Ecoboost
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2ty
I find that simply running a faucet until the pump sucks air does not  completely empty the fresh water tank.  It took several flushes using that technique to remove all of the bleach from the system. A better method is to use the tank drain (not to be confused with the hot/cold water line drains). Our drain (189R) is on the passenger side between the two tires, it's a little hard to get to but seems to completely drain the tank (assuming that the trailer is reasonably level).
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Dr0idAttack
Anybody have issues getting the pump going when dewinterizing? The city water flows just find, but my pump pulls some water through then just air and sputtering water (and the fresh tank is full.)
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mikes
Did you close the valve on the "goes nowhere" hose (which is used to suck antifreeze from the bottle)?
Mike
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Dr0idAttack
Umm yeah just found that hose behind a panel that is screwed into a space below the fridge. Now I don’t have splutter but I don’t have anything .
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Dr0idAttack
Oh there is another valve also; now it’s working!
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