I had to redo my plumbing for my washer since we wanted to move it to a different wall. I didn’t look up slope until after everything was completed. I put about an 1” fall over 8’. Is that enough fall or do I need to add more somehow? Pipe size is 2.5” from washer drain then 8’ to 3” vent and drain. Let’s just say I did have to add more fall.. well is it possible to install a pump bc cabinets are in, countertops are in and everything is painted. I really don’t want to have to tear all of it out just to fix the slope. Thanks in advance for advice.