Did you know that you can reduce your water usage by 12 litres a day with a Save A Flush – that’s a saving of £8.90 off your annual water bill. Save-a-Flush is an environmentally friendly way to use 1 litre less water every time you flush the loo. The Save-a-Flush bag contains a biodegradable polymer which swells on contact with water, plus a little sand to provide some weight. Simply pop it into your cistern, and let it sit there displacing a litre of water every time you flush.