Holding tank vent clogged or obstructed?
When emptying the gray tank I noticed that it will flow fairly well then slow, followed by a whoosh sound and then drain completely. Also, after dumping the black tank I am noticing an odor. After rea...
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Your emptying of slow drain, then hearing of a swoosh if very normal, its either the solids leaving last or else the vacuum balancing out as mentioned.
