Shubha filled up a one litre plastic bottle and plonked it inside the cistern this morning. The flush works as good as it did earlier - and each full flush needs a full litre lesser!
Now assuming just 5 full flushes everyday, for each of the 152 homes at Redwoods....
Thats 5x152 = 760 litres a day
or 22800 litres a month!
i.e. 22800/6000 = 3.8 tankers a month!
or 277400 litres a day
i.e. 46+ tankers a year!
At 400 a tanker, thats nearly 18.5k saved
And it probably more than just 5 flushes a day per home. Plus, there's the overall awareness about water usage. other "tricks" - smaller buckets, shorter showers (as someone put it - shower for less time than it takes to fill your bucket up!), reusing the "waste" from the Reverse Osmosis water purifiers most have installed.