A drain that keeps blocking usually needs more than another quick clear. The pattern of the blockage can tell you where to look next.

Notice which fixtures are affected

One slow basin may be a local fixture issue. Several affected fixtures, gurgling or outside overflow can point to a larger section of drain.

Consider what is going into the drain

Grease, hair, wipes, debris and tree roots can all contribute, depending on the fixture and pipe location.

Note weather, usage and how long a previous clean lasted. That history helps guide the next investigation.