This has been an interesting thread. Our tank is downhill from the house, but then pumps up 200 feet to the leaching field. The system is in its 6 season of use and works great, we had it pumped last year and they said it looked good.
The only issue we have is once the pump stops the 200 ft of pipe drains back into the tank, thus forcing fumes out the vent on the tank. So then we get some smell that lingers. I wonder if the charcoal filter would work in this situation.
Our installer painted the vents on the leaching field with brown paint and it blends in nicely.
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