Is there any benefit to leaving open the grey/black tank sewer line and covering the opening with a screen to let fresh air in the tanks when the camper is sitting in the driveway.
There is no reason to dry out the tank, in fact I always leave a "starter" solution of 5 gallons and a tank treatment. This keeps the tank stable and fights back any possbile sewer gas issues.
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Mike
2013 Jayco Eagle 334RBTS
Crossroads Forum Lurker
Another reason is that no matter how clean you "Think" you have the black tank, opening the valve without a sewer hose connection to the sewer will "always" surprise you.
Drying out the tank is a sure way to turn the junk that is left in your grey or especially black tank into cement. You shouldn't do that. Better to follow mwebber78's procedure.
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