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Old 01-12-2025, 03:40 PM   #1
Chris n Elaine
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Fresh water tank sanitizing

Have a 2021 331 RL went to flush the fresh water tank and put some additive to tank. The instructions say to use the tank vent to add the sanitizing solution.
Problem is that even though I use a tube to get down the vent pipe it will not allow the solution to back fill into the tank. Any thoughts?????
I am going to try using a syphon pickup tube on the fill hose and see if it will pickup the solution while I am filling the tank.
Also as a side note there doesn't seem to be a direct drain valve on the fresh water tank.
To drain the fresh water tank I have to open a valve by the back left jack and turn on the water pump. Any thoughts on that matter also????
 
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Old 01-12-2025, 05:36 PM   #2
Rondo
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Check under the unit behind the rear axle and see if you see a tube hanging down with either a cap on it or a valve on it. That is your fresh water tank drain.
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Old 01-12-2025, 07:25 PM   #3
Chris n Elaine
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Thanks for the thoughts, Yea I have that valve . I thought that was the tank drain, but the only water I get out of it is if the water pump is running. No gravity drain.
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Old 01-12-2025, 07:41 PM   #4
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I fill my hose with bleach and then fill the tank from the hose using the fresh water fill.
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Old 01-12-2025, 08:32 PM   #5
Chris n Elaine
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Yea that is a good thought. Thanks
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Old 01-13-2025, 04:21 AM   #6
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Originally Posted by Chris n Elaine View Post
Thanks for the thoughts, Yea I have that valve . I thought that was the tank drain, but the only water I get out of it is if the water pump is running. No gravity drain.
If your pump is required to get water out of that drain, it may be the drain for the ice maker if you have a residential fridge.
The fresh tank is behind the rear axle. Look further back. It could be that they forgot to cut a hole in the coroplast and drop the drain hose through.
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Old 01-13-2025, 08:33 AM   #7
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I fill my hose with bleach and then fill the tank from the hose using the fresh water fill.
I do the same thing.
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Old 01-13-2025, 09:24 AM   #8
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Thanks for the thoughts. The drain I am referring to is located behind the rear axle near the rear jack. But it would not surprise me if they didn't drop it down. The under cover in that area had been opened up for a warranty issue, so no telling if it got covered up. Guess I will dig into that area. Thanks everyone for their thoughts. I will post what I find.
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Old 01-13-2025, 10:14 AM   #9
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I fill my hose with bleach and then fill the tank from the hose using the fresh water fill.
I do the same.
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Old 01-14-2025, 08:43 AM   #10
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Attach the blue coiled shower hose on the outside of your camper, inside the convenience center, to the water hose connection port and flip the valve to "fill".

Now put a very strong bleach solution into a bucket and pump the bleach solution using the Winterizing port. (Make sure your water heater is in by-pass.) Turn on the outside shower (blue hose in the convenience center). This will pump the bleach water solution into the fresh water tank.

After the solution is pumped in, add clean water to the bucket and now pump the clean water through the Winterizing port with the water pump. This step flushes out the STRONG solution and prevents the bleach residue from damaging anything. So, it's real important you follow the initial bleach solution with the rinsing clean water solution.

Once you've sent a couple buckets of clean water through the pump and through the lines filling your fresh water tank, connect the garden hose to your fresh water tank fill port again, and flip the dial from Normal Run to "Fill" and fill the fresh water tank. (Make sure you flip the Winterizing valve off too... you don't need this any more).

The solution in the tank will now be diluted and safe to sanatize the rest of the camper.

This works, and works well. It sounds complicated, but it's not. It's actually very easy. The trick though, is to determine how much bleach to initially put into your tank. Figure that out and then you can dilute that into as many buckets you want until you get it all pumped into the fresh water tank. Again, once it's there, fill the rest of the tank with fresh water.
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Old 01-19-2025, 05:25 PM   #11
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Another way
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Old 01-19-2025, 05:29 PM   #12
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1/2 inch tube with cap hanging down below is th fresh water drain on mine.
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Old 01-20-2025, 01:56 PM   #13
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Another way
That’s the way I do it. Add the bleach to a 1 gal. Milk jug then full it up. Then pour it in the funnel. The hose from the funnel goes all the way into my fresh tank through the overflow. When all bleach solution empty, fill fresh tank and pump through all the lines. Wait at least 8 hours ( I let sit overnight) then flush well.
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