I love all you folks yammering about GRAY WATER.
Guess what.. NOT GRAY WATER
There are 4 different "Waters" in an RV (not counting engine coolant)
Fresh
Black
Gray and
WASH... Your shower drain is WASH
Wash Water is bathroom sinks (lav) Shower, Washing machine (IF present) But **NOT** the Kitchen Sink (Food particles)
GRAY is the Kitchen sink.. Of course on many RV's (not mine) thy all drain into the same tank so the was,meets the kitchen sink water, it becomes Gray..
But on my Rig the Shower, and the main bath Lavs (2) Drain into one tank
Washing machine is Non-Exist and I do now knwo where they routed that drain to but suspect Wash.
Kitchen and half bath lav drain into Gray
We all knwo what goes in Black.
IN MANY areas it is 100% legal to dump WASH water almost anywhere.
Some places you can dump Gray as well (Way fewer)
Black ALWAYS must be disposed of properly (Sewer/septic system).
NOTE I said MANY above.. I did not say ALL.