Water use in public and staff amenities can account for 15-40% of your total water usage, depending on your business activity. The volumes of water used by toilets, showers and basins are often overlooked, which makes this area an easy target for water savings.
A good example is a full flush toilet, which uses about 11 litres per flush. In comparison, a dual flush toilet can reduce a full flush to 4.5 litres and a half flush to three litres. If you have 100 users on a daily basis, this can save you up to 1,100,000 litres annually.
Flushometer systems use valve-controlled water pressure to produce a flush into a toilet bowl. Due to variance in pressure and the nature of the flush controller, these systems can use 13 litres or more per flush. Replacing these systems with 4.5/3 litre dual-flush systems will produce the most water efficient solution.
Some urinals can waste a lot of water, especially those with cyclic flushing cisterns. Single stall, manual-flush urinals are the most efficient as they only require water to cleanse the contaminated area. Waterless urinals are also a water efficient alternative.
Before you install a waterless system, get a licensed plumber to assess your plumbing. It needs to meet Plumbing Installation Standard AS/NZS 3500.