Quote Originally Posted by BetterSense View Post
Now, the apartment is on the second floor. Assuming the pipe runs straight down at least a couple feet, one could possibly stuff one of those check-valve-ended quick-siphon hoses down the pipe low enough to simply start a siphon....I think gravity feed is the way to go.
I quite agree. A simple siphon is what I had in mind in my first post; you'll use it to evacuate to the washer drain outlet whatever water and chems have accumulated in whatever holding vessel you use to collect the sink effluent.