The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
Umm... I have never tasted it (YUUUK!!!) but I would guess that there is some salty content in it, but it is mostly crap in there. Maybe you'll taste it and let us know???
question is, why do you wanna know? I wouldn't try using it as a plant fertilizer or anything like that. just dump it down the sink, with plenty of water.
Running a skimmer wet will definatly effect SG to some effect.. I doubt that it would be much of an issue if its dialed down to black coffee skimmulate though..