My grey water tank empties in the same fashion. Fast start, then gets slower, and in the end, the dam breaks and the balance rushes out. Could be the vent tube too low in the tank. The water slows as vacuum in the tank slowly increases, until the tank level drops below the end of the vent tube. Then with good airflow restored, the balance of the water rushes out.
Can't understand why the lame manufacturers don't put a 3" valve on the grey side.
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Ken
2006 34' Limited
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