All the toilets in our office are now equipped with water saving devices called Hippos. Fitting a hippo in larger cisterns can save up to 3 litres per flush! This can save you 5,694 litres a year. As we have 2 large cisterns fitted with hippos, we save approximately 11,388 litres of water per year. You can get them for free from Thames Water at http://waterwise.fortune-cookie.com/hippo-hotline/

What is a Hippo?

A Hippo is a small plastic bag which can easily be fitted into your toilet cistern. Water is retained in the bag, helping to save water every time you flush.