Drainage fixtures, blockage materials and symptoms
Drain blockage library
Guidance on common drain blockage materials, the fixtures they affect and the symptoms that can distinguish a local restriction from a problem further along the drainage system.
A slow sink on its own points somewhere different from several fixtures backing up. A gully that overflows only during rainfall raises a different question again. Looking at which outlets are affected, and when, helps narrow down where a restriction or fault may lie.
Affected outlets: one sink or toilet, several fixtures, or an outside drainage point.
Timing: continuous, after another fixture discharges, or only during rain.
Material: suspected wipes, grease, leaves or another known obstruction.
Current condition: slow drainage, backing-up, overflowing wastewater or loss of use.
Reference sources for this library
The references below cover the products, drainage systems and blockage materials used in this library. Manufacturer information describes the named product or system only; it does not establish the condition, suitability or requirements of a particular installation.
How hair and soap residue restrict showers, baths and basins, and how to distinguish a local waste-pipe problem from an issue affecting shared bathroom drainage.
How fats, oils and grease build up in kitchen drainage, how local waste-pipe restrictions differ from downstream blockages and why recurring deposits need further investigation.
How wet wipes contribute to drain and sewer blockages, what different symptoms can indicate and when a recurring obstruction may need further investigation.
Food scraps should be kept out of drains. In commercial kitchens, sink strainers and grease-management equipment reduce solids and fats, oils and grease entering the waste system.
