grey tank vent on 2018 3050S sunseeker
When I dump the grey tank - near the end, there is a chugging of air back up into the tank. There is only a black tank vent through the roof. There is of course the "air adminttance" valve near the kitchen sink that is supposed to let air into the tank but not out - which I presume is either broken or can't possibly let enough air in to make up for the water rushing out.
And if it all worked - how does air get out of the tank when you run water down a drain? Back up through the P-Traps?
Why no grey vent. Is this yet another way FR saves a few bucks by designing a deficient system? Anyone know how the grey system is built on this unit?