Before you pour
Why chemical drain cleaners often fall short
Chemical drain cleaners can open a small channel through a clog, which may let water pass for a while. The rest of the buildup often stays on the pipe walls, so the drain slows again. Repeated use can also be hard on some piping over time.
Professional drain cleaning works on the blockage itself. Plumbers use specialized equipment to clear the pipe and restore flow, which also gives a better picture of whether the clog was simple buildup or a sign of something else in the line.
