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.

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Understanding drainage symptoms

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.

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Blockage materials

Wet wipes and drain blockages

How wet wipes contribute to drain and sewer blockages, what different symptoms can indicate and when a recurring obstruction may need further investigation.

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