Save one litre of water with every full flush!

Here is a water-saving tip I have implemented for a few months now and the water consumption has come down noticeably.

The normal cistern tank fills about 9 litres of water, and so every full flush flushes away 9 litres of water. All you need to do is get a one-litre drinks bottle, fill it up with water, and close the lid. Just place it right at the bottom of the tank, make sure it does not obstruct the movement of the float.

From now on, every full flush would use just 8 litres of water. You save one litre per flush. Calculate how many litres of water you can save every day and every month.