If you have a full hook up do you leave tanks open or close. Hubby said I am wrong I say both should be closed till full for persuit to empty need to win this one. I really think I am right, help me o...
Not fun to be in the shower when the grey tank is full and stand in your own scum.
I always close the black. I always leave the grey open. "EXCEPT" about once a month I will leave it closed and then let it drain in a couple days and flush.
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