As far as slime in the coffee maker...you are suppose to clean your coffee maker at least once a week. How u do this is ---you just pour vinegar and water as if you would pour the water to make coffee. ONLY do not use coffee grounds . You are NOT making coffee...You are just letting the vinegar and water run through to clean the inside...then do another one, but leave out the vinegar in the water the 2nd time. Use distilled water with the vinegar when you do it the first time and used distilled water when you do the 2nd run...it takes away all film.
It does make some percolating noise during the process and just at the end it makes one last "loud" percolating noise. It's hard not to hear it. I use mine at my cubicle. Haven't had any complaints except that the coffee smells good.