Just changed the shower head to a 1.5gpm unit and changed the bathroom faucets to 0.7gpm from the old 2.0gpm. Will go to home depot and lowes to check out low flow toilets.
I found a good article.
Our latest tests of 25 toilets show that the best performers still use the standard 1.6 gallons of water per flush. But some greener models deliver comparable flushing and save hundreds of gallons per year for the same price or less.
Kohler's new Cimarron K-3609, one of three CR Best Buys at $300, sailed through our tough solid and liquid waste tests nearly as well as two pricier models from the same brand. Yet it meets the 1.28-gallon limit for the Environmental Protection Agency's WaterSense program, which is to toilets what the Energy Star label is to appliances. It would save an average household roughly 650 gallons per year over 1.6-gallon toilets and 4,000 gallons compared with older models that use 3.5 gallons per flush. Gerber's 1.1-gallon Ultra Flush, $400, saves even more for the same price as many 1.6-gallon models.
Some more-miserly toilets are a response to tougher rules. Parts of Florida and California now require WaterSense toilets. You'll also see more dual-flush toilets that use less than a gallon on their separate liquid-waste setting. But our liquid-waste tests show that some "green" toilets can be wasteful. Our tests with up to 160 plastic balls and seven screw-laden sponges also found some pressure-assisted toilets especially raucous and some full-flow models relatively low on flushing power. Here are the details:
Gravity-flush models get better
Larger flush valves helped the top-scoring, gravity-flush American Standard and Kohler vanquish waste as well as the most powerful pressure-assisted toilets, but without the wall-shaking whoosh that typifies pressure models. Indeed, both top-scoring gravity models aced our solid-waste tests with roughly half the noise.
When a miserly flush isn't
Toto's UltraMax II,$510, is among those that use just 1.28 gallons per flush. But clearing the blue dye in our liquid test took two flushes, or a whopping 2.6 gallons. The dual-flush Caroma and Kohler were also poor in our liquid tests. And like the other dual-flush models, they use a full 1.6 gallons on their solid-waste settings.
High flow can mean wimpy flushes
Kohler says its 1.6-gallon Cimarron K-3489 delivers "exceptional bulk waste removal," while the Briggs Maelstrom promises to virtually eliminate clogs. But don't expect a torrent of power. The Kohler clogged nearly one in four times in our solid-waste tests and often required multiple flushes. The Briggs clogged almost half the time and also needed multiple flushes.