Hundreds of reeds have been planted at a Hampshire treatment works as part of a project to make it more environmentally friendly.
Southern Water is investing more than £1 million to upgrade Petersfield Wastewater Treatment Works.
Reed beds are used to give wastewater flowing through the site an extra clean before it is recycled into the environment. The reeds send oxygen into the gravel through their roots, helping break down any impurities in the wastewater as it flows through.
The upgrade will also include new monitoring equipment, which will continually check that the treated wastewater leaving the site meets stringent new standards set by the Environment Agency.
Southern Water Senior Project Manager Heather Barber said: “The aim of this scheme is to improve the natural environment around the Petersfield works.
“We’ve reached a key stage now that we’ve planted the reed beds, which provide an extra and completely natural stage of treatment.”
The improvements, which are being carried out by contractor 4Delivery, are due to complete in July 2013.