| If you have... | Choose this type... | | :--- | :--- | | A slow kitchen sink from grease | (thicker formula sticks to pipes) | | A shower draining slowly due to hair | Caustic liquid or a mechanical snake first | | A completely standing, blocked pipe | Acidic (with extreme caution) or call a plumber | | No clog now, but want to prevent odors | Enzymatic (weekly use) | | Old metal pipes or plastic pipes (PVC/ABS) | Enzymatic or Caustic (sparingly) – avoid Acidic |