| Type of Blockage | Effectiveness | Notes | |----------------|--------------|-------| | Grease/fat | High | Rapid saponification | | Hair | Moderate to High | Requires longer contact time (30+ min) | | Soap scum | High | Dissolves calcium soaps | | Food waste | Moderate | Works best on soft solids; ineffective on fibrous veg. | | Mineral scale (lime) | None | Acid (e.g., muriatic) required | | Solid objects (plastic, metal) | None | Physical removal needed |
Before you even open the container, you must understand the risks. Caustic soda is extremely corrosive.
If caustic soda clears the drain but it clogs again within a week, you have a structural issue—perhaps tree root intrusion or a collapsed pipe. In this case, chemical cleaners are a temporary Band-Aid, and you need a plumber with a drain camera.
