Quote:
Originally Posted by Hawkpat
Emptied galley tank then used a 2 gallon bucket to hand fill. It took 16 gallons before it backed up into the sink. Specs say 80 gallons grey water capacity so I assume 40 gallons per tank.
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You may have the dreaded floating scrap of circular plastic from a hole cut-out in your tank. When the water level gets low enough, it floats over and covers the drain outlet. IF so, you make have to 'snake' the drain from the outside to get the thing out.