sanitize the fresh water tank for sure. Sometimes it will form algae in the tank. As if just having that nasty stuff in your tank, it will break loose and block you lines. I don't use the fresh water tank and didn't sanitize the tank. it was a mess to clean up.
Retired Fire Dept Battalion Chief
2016 Ever-Lite 232RBS
2012 F150 FX4 W/Max tow & Ecoboost
Getting old ain't for wimps!!!