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With the history of the tanks breaking loose and cracking, I would prefer to not run with 10 to 15 gallons of liquid in any of the waste tanks. 2 to 4 gallons MAYBE, but never 10 to 15.
Your mileage may vary, as they say. Calgon works great, I use a bit of laundry detergent in the black tank, and nothing but Calgon in the two gray tanks.
If we raise the front of Tana that high I can guarantee you that the kitchen gray will not dump due to the almost level discharge lines. I guess we could raise, and then lower. Not that I see us doing that, us being a big lazy. But, I guess you could.
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