When we had our septic replaced a few years ago, we also ended up with one pipe significantly higher than the other. We were told that since our new leach field was on higher ground than our camp, the pipe closest to the distribution box had to be higher than the main house vent. I think that the Presby website for the Enviroseptic baffles had a pretty clear explanation of the reasoning for this but I have forgotten most of it.
We painted the pipe in cammo tones and had it re-piped so that it rested against a close-by tree. I hope that we never have to take that tree down...
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