Flushing Tanks
After mush discussion with "elders", I purchased a sleeve that fits in the toilet bowl and allows the black tank to fill after the original flush and rinse. By filling from the top, I don't have to worry about over pressure, and can fill the black tank completely. Two runs of 30+ gallons completes the flush, and allows me to put about 5 gallons for "sloosh cleaning" going down the road.
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