Unclog sewer drains

We live in an old house and the sewer pipes get clogged a lot. I got tired of paying a plumber $150 to clear the pipe every time it clogged, so I bought this $22 hose attachment, called a Drain King. It’s a rubber bladder that you insert into the sewer line opening. When you turn the hose on, the bladder expands, forcing the water to push the clog out. It has never failed me. Read the glowing testimonials on Amazon for this thing. — MF