Originally Posted by Brandon327
What gray tank does the washing machine drain into? How many gallons is that tank and which one does the shower drain into and how many gallons is it?
SabreSam would be the best source for a real answer- but, given that the washer/dryer is the to the front, I'd guess that it goes to the first gray tank which is also shared by the shower and sink (in the full bath). It's a 42-gallon tank.