WC Water Saving Devices – Renergise Supply A Full Range Of WC Water Saving Devices. We supply toilet water saving products for both commercial and domestic WC and toilet flushing systems. The Toilet Tank Bank is an easy-to-use, quick-to-install very simple water saving device. The Water Saving Toilet Tank Bank is one of the easiest to use WC water saving devices, simply fill it with water and clip onto the inside of the toilet cistern wall. With a patented air lock and fill valve, the Toilet Tank Bank eliminates water evaporation and odours and will never require maintenance. Saves an approximate 2 to 3 Litres of water per flush depending upon whether one or two are used. With the average person flushing a minimum of six times a day the Toilet Tank water savings will soon add up. In the workplace each employee uses the toilet on average 3 times each day and over the working year this amounts to 6000 litres (6 cubic metres) of water. By installing our Dual Flush Syphon you can convert your existing toilet to a dual flush system in minutes & start saving water every time you flush. The dual flush syphon delivers water-saving reduced flush when lever is held down and full flush when lever is depressed and released.