Old systems were starting to fail and expensive tankering had become the only way to dispose of waste water and effluent safely.

The Zoo assessed a number of options from connection to mains sewage to installation of a new mechanical plant to development of a native reedbed system. The creation of a reedbed system was not only the cheapest option in terms of set up but also maintenance. In addition this option had a number of other benefits including enhancement of the site in terms of native biodiversity and education.

The total project cost £640,000 (with an additional £140,000 for visitor experience elements) compared to an estimated £900,000 for a similar sized mechanical system. It also had the added benefits of lower maintenance costs and reliable carbon emissions through use.

The project has led to a reduction on costs related to water treatment of 37% and a reduction in related carbon dioxide equivalent emissions of 28%.

In addition, the site has seen and additional 252 species of plant and animal between 2008/9 and 2012/13 including nine locally important (BAP) species.

The project has also provided the Zoo with a new exhibit and educational facility that is currently enabling us to engage with over 19,000 people per annum on sustainability and native species issues.