I'm very curious how this could be.
3 questions come to mind.
Shouldn't the vent prevent this? What is the correct way to pump out? Very slowly?? and what is the explication for the phenomenon? Vent is only big enough to release vapors?
Al I couldn't in a million years imagine a prevo in a site next to me pumping a holding tank into a kids swimming pool. Not something I'd expect to see the average Prevo owners do. What of the pool when you're done, burn it? Yikes.
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