Dual flush toilets reduce the volume of water been flushed. Older toilets have cisterns of between 10 and 12 litres, where in fact only half of this water volume is ever necessary. Modern toilets have more sensible cisterns of around 6 litres, and even this is unnecessarily wasteful for flushing liquids – you can save a lot of water by installing a dual-flush or multi-flush device in your toilet. The dual flush device has two fixed settings – a light setting for urine and a heavier one for solids.
What you need to know:
- A saving of up to 20% of your total water consumption is achievable
- If an entire toilet is replaced, the payback period could run into a number of years
- To reduce the flush volume without any new installations, you can put a displacement container in the cistern – try a 2 litre coke bottle filled with water or a heavy device that will not dissolve in water
- Make sure your light setting flushes adequate water volume to clear the toilet bowl properly. If too little water is flushed, a second flushed is required, wasting water unnecessarily