Once cleaning is complete, the world's largest spray chlorination unit is deployed to ensure no contamination remains in the line.

This process saves even more water as the main requires only a single, rather than double fill, to complete the process.

Typical results where iron, aluminium and manganese are the main contaminants, show 5.2 milligrams of iron per litre, in comparison to the Drinking Water Inspectorate standard of 200 milligrams.

Aluminium levels of 2.6 milligrams per litre also compare extremely favourably with the DWI limit of 22 and manganese is recorded at around 0.28 milligrams per litre – against a DWI standard of 50.