Hello; my gray water tank is supposed to be 15 gallons but does not drain after 10 gallons are in it.
I tested by hooking up to city water, filled 2 gallon bucket, with 2 and 4 gallons the indicator read 1/3 full, drained fine.
at 6 drained fine and indicator read 3/4 full,
8 gallons drained fine and indicator read full
10 gallons drained but could see water almost to the top of the drain.
12th gallons the water didn't drain out of the tub.
Any suggestion or thoughts on why were not getting to fill the whole tank ?