Welcome to the forum Danneli!
Originally Posted by Danneli
I am still a newbie so have patience with me. I have a 2018 Midwest Weekend Sprinter. I have drained the black and gray tanks twice and both times I turn the open each tank turn on the macerator pump and within 10 minutes it gets to 1/3rd and then I wait for a half an hour and the light does not move off of the 1/3 full marking. I am sure there is a trick to this that I am not getting. Is there someone who knows the trick?
Not sure I understand your problem, but I hope you have not let your macerator pump run more than 3-4 minutes at a time (all it should take to empty your gray and black tanks). And I hope you never run it more than 10-15 seconds once thanks are emptied. The dumping fluid keeps the pump impeller lubricated and with out it, friction from heat can destroy the rubber impeller blades fairly easily.
Please tell me you haven't run your macerator pump for up to half an hour.