Water conservation is one of the most important steps we can take to protect the environment. Fresh water is not only a finite resource, it is becoming more expensive. There are many instructables that show how to make a low flow toilet by adding a jar, but this is not a variable flow toilet. Low flow toilets often can not get the job done with one flush, so more water is wasted with two flushes. The solution is to use variable flow toilets, which can provide two sizes of flushes. Unfortunately, they are very expensive, starting at $400.
Here is a method of constructing a variable flush conversion for about $10. Not only does it provide substantial savings on your water bill over a period of a year, it is a very environmentally friendly project.http://www.dualflushkit.com/uploaded_images/cms_files/dualflush_toilet.jpghttp://images.channeladvisor.com/Sell/SSProfiles/13000155/thumbs/51/tn4_940583.jpg