main drain problem

I would like to get your recommendations on troubleshooting and fixing main drainpipe leakage and possible washer standpipe design issue(s). Background: One of our younger relatives remodeled our laundry room in our Salt Lake City, UT basement a couple of years ago and we have had some issues...

My first post here, thank you for having me! I have a septic system that I try to keep clear but no flushing any toilet paper, napkins, etc and I use ridx to keep the septic clean. I have a downstairs bathroom and two upstairs, three days ago the bathroom downstairs started to spill water...