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Drain valves
There is no reason to leave either valve open continually, and lots of reasons NOT to.
The first is sewer gases. There is no P trap to hold water in the main drain, keeping sewer gases out of your tanks and vehicle. In addition to smelling bad, there are health and safety issues. Forming a little hump in the form of a P trap in your hose is not going to accomplish the same thing.
Also, wild animals, most notably rats, and others, are frequent guests in the plumbing of drain fields and septic tanks. With an open drain valve, don't be surprised to find one in your tank, or even your home!
What would be the advantage of leaving one open?
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