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Your RV has to have an outside fresh water tank overflow vent, somewhere..
That said a much easier way to sanitize is...
Drain water heater and reinstall anode..
Remove city water hose and drain it out some
Pour in i cup of bleach in the hose and reconnect
Have water heater bypass on if you have an outside knob to do so..
If not then skip that step
Turn water on and fill fresh water tank about 1/4 full
Now turn city water off and select water valve for water pump use
Run water pump and open each fixture and run water a minute out of fixtures
Do the toilet as well
Now let the mixture sit in the lines for about 24 hours if possible
Drain water heater again and drain fresh water tank
Refill with water and run fixtures and your done
The step of allowing the mixture to set for several hours is KEY to give the FREE CHLORINE in the water lines to do its job
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