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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Our rig has a vacuum breaker under the bathroom sink and another under the kitchen sink. They are spring loaded rubber flaps that will allow air to enter the tank as the water goes out. That is what makes the sound as the water gets out enough to create a vacuum in the tank. I always dump the black tank first, leave the valve open while dumping the grey tank, then close both. Then I add some liquid fabric softener to the black tank along with a gallon or so of water. Supposedly the fabric softener keeps the seals pliant and is not harmful to the septic system.
