Identify the scope
One slow fixture is different from several fixtures backing up at once.
Avoid chemical mixing
Health Canada warns that household chemicals can cause poisoning, burns, fires or explosions when mishandled; do not combine drain or cleaning products.
Use only simple user-serviceable maintenance described by the fixture maker
Do not force unknown tools into plumbing.
Call a plumber for recurring or multi-fixture problems
Repeated blockages, sewage backup or inaccessible lines need professional assessment.
General consumer information only. Do not mix cleaning chemicals or improvise electrical, chimney, high-access, pressurized, drain or other safety-critical work. Follow Canadian product labels, recall notices and the exact manufacturer’s instructions.