I had a pre-existing area remodeled to add a shower stall. Within a week the drain is extremely slow. Nothing has entered the new drain. It drains when I use a plunger, but continues to drain slowly right after. What could be causing this problem?
When doing the work did someone stick a rag in the drain to stop the gases from coming out? This is very common. Maybe it or a tool or debris got into the drain and stuck, maybe at the trap, maybe at a bend, and when you plunge the drain it is moved enough to drain the water but then settles back into place. Try snaking your drain to see if there is something in there