The Aqus System is a great product. If you want to maximize your water savings by never having to use clean drinking water for flushing the toilet, I would highly recommend installing a Dual Flush toilet in combination with the Aqus System. Caroma toilets offer a patented dual flush technology consisting of a 0.8 Gal flush for liquid waste and a 1.6 Gal flush for solids. On an average of 5 uses a day (4 liquid/ 1 solid) a Caroma Dual Flush toilet uses an average of 0.96 gallons per flush.  The new Sydney Smart uses only 1.28 and 0.8 gpf, that is an average of 0.89 gallons per flush. This is the lowest water consumption of any toilet available in the US. Caroma, an Australian company set the standard by giving the world its first successful two button dual flush system in the nineteen eighties and has since perfected the technology. Also, with a full 3.5″ trapway, these toilets virtually never clog. All of Caroma's toilets are on the list of WaterSense labeled HET's http://www.epa.gov/watersense/pp/find_het.htm and also qualify for several toilet rebate programs available in the US. Please visit my blog http://pottygirl.wordpress.com/ to learn more or go to http://www.caromausa.com to learn where you can find Caroma toilets locally. Visit http://www.ecotransitions.com/howto.asp to see how we flush potatoes with 0.8 gallons of water, meant for liquids only. Best regards, Andrea Paulinelli