Kitchen sinks drains to shower tub
Help! I'm a first time home owner with an Eichler built on concrete slab from the 1950s in Northern Cal. My kitchen sink is draining into my shower tub up through the drain. The shower then takes *hours* to slowly drain away. Meaning we can't wash dishes or us! Bathroom sink and toilet drain just fine. And the kitchen sink doesn't appear to back up at all. I washed dishes the first night without realizing the problem until the next day.
Reading through the forum I have the idea that I'm going to have to snake something, but not a clue how or where to start. Should we just break down and call a plumber?