Water saving insert for W.C. cistern

摘要

A water saving device for water storage vessels such as flush cisterns, the device comprising a perforated plastics bag (11) containing, in granular form, a super-absorbent polymer which, when wetted, expands to two hundred times its pre-absorption volume. The bag is preferably weighted and may be simply placed in a cistern (14) where it rapidly expands to displace between 2 and 5 litres of water within a cistern otherwise containing at least 9 litres, thus significantly to reduce wasteful water consumption.