All that is involved is a truck with pump capabilities such as is used for pumping septic tanks out. They will run their hose to your dump valves and pump out the tanks.
I've heard some say that the strong suction can cause problems with the toilet seals. I've only done it once, at GNR last year, and had no problems.
Cost varies at each event. We paid $15.00 when we had ours pumped, I've heard of as much as $40.00 depending on the event.
Chris
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Chris McVetty
Murfreesboro TN
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