AN £18 million upgrade is underway at Marley treatment works aimed at improving water quality in the River Aire.

The work is designed to reduce the amount of phosphorus contained in wastewater entering the river post-treatment.

Phosphorus – which can be found in products such as shampoo and liquid detergent – enters the sewer system via domestic showers and washing machines, and may also wash off from fields after fertiliser use.

Whilst a small amount is harmless, it can become damaging when unmanaged.

The scheme at Marley, where Yorkshire Water contract partner Galliford Try is entering phase two, is part of a £500m investment in phosphorus reduction region-wide. Work is scheduled for completion early next year.

David Hobman, lead project manager at Yorkshire Water, says: "This is an important project.

"It’s essential we look after our rivers and help them thrive."

Also, Ponden water pumping station is to receive a £1.5m revamp, subject to planning permission.

The work, to be carried out by Barhale Enpure, will include the installation of new pumps and upgraded power units and controls.

As a result of the scheme, there'll be the capacity to pump more 'raw' water from Ponden reservoir to Oldfield treatment works.