Came to the rescue

Blocked sewer, so I had to call the experts. About a year ago I had the same problem and tried to fix it myself die two days and that did not work... So I called them right away now. After two hours he came with a HP pump and fixed it. Not a nice job; he had to go under the house. I think it might be the sewer from the house where it's connected to the community system, maybe the roots of trees....

He was fast, I forgot to take a picture of him!