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Dual flush = High efficiency toilet

#1
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"One high-efficiency model that's gaining in popularity is the dual-flush toilet, in which users press one button to flush liquid waste with 0.8 or 0.9 gallons of water, or an adjacent button to flush solid waste with 1.6 gallons. The flushes average out to about 1.3 gallons, complying with the EPA's definition of a high-efficiency toilet."

 

and from the same article...

 

"The future is now in thirsty California, where Gov. Arnold Schwarzenegger recently signed a bill mandating that 50 percent of toilets offered for sale in 2010 meet the high-efficiency standards, ramping up to 100 percent by 2014. Conservation groups hailed the law as an easy way for people to help the environment." (New Toilets Meeting Conservation Needs by Dinesh Ramde, 9 December 2007)

 

HE toilets could make a big difference considering the potential for a devastating (and disasterous) loss of fresh water.

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#2
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Wouldn't raising the tank back up (like the turn of the century pull chain types) add more pressure for flushing?

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#3
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That's odd, the dual flush toilets I looked at said they were 1.4/1.6 gallon per flush, rather than 0.8 or 0.9/1.6.  I wonder if I read that wrong.  Because dual flush seems like a really good idea, but if it uses more water than the single flush 1.28 gallon toilets, there's not much point.

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#4
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In New Zealand, dual flush toliets are pretty common- in homes, and in public bathrooms.  They work really well- my husband says he'd never seen a plunger in a home bathroom until he came to America!

 

NZ toliets also send the waste down the hole differently.  Instead of swirling around, it just explodes straight down the hole.   This seems to minimize the amount of water needed. 

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#5
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Toilets account for almost 30% of residential indoor water use in the United States.

Toilets are also a major source of wasted water due to leaks and inefficiency. In a home that was built prior to 1993 it is most likely that the toilet uses 3.5 gallons or more for every single flush (in Dekalb County alone, approx. 165,000 homes were built prior to 1993 - there are approx. 1 Mio. Homes in the Greater Atlanta area that still have old, inefficient toilets in use). Experts say that the minimum needed to meet the basic human needs of drinking, cooking and hygiene is five gallons of clean water per person per day. It’s far from enough to ensure health and well-being-just enough to get by. Do we really need to flush down that much each time we go “Number One”?

In the beginning of modern toilets there was the seven-gallon flushing porcelain lavatory. Then there was the low-flush toilet. And by the time you’d flushed several times the bowl was “clear” and you had flushed more water than you did with the faithful lavatory.

Then there was the new and improved low-flush toilet, which was better but still not what always got the job done. And finally, the High-Efficiency toilet arrived; you now have your choice of flushing as little as .8 gallons with dual flush toilets. The best part is that they really work!

What Are High-Efficiency Toilets?

Under federal law, toilets must not exceed 1.6 gallons per flush (gpf). High-efficiency toilets (HETs) go beyond the standard and use less than 1.3 gpf. The WaterSense label will be used on HETs that are certified by independent laboratory testing to meet rigorous criteria for both performance and efficiency. Only HETs that complete the third-party certification process can earn the WaterSense label.

 

Do High Efficiency Toilets Work?

Everyone is concerned about the performance of low-flow toilets. Do they clear the bowl and leave it clean? Do they stop up frequently? Unlike the first 1.6 gallon / flush toilets, WaterSense HETs combine high efficiency with high performance. Advances in toilet design permit WaterSense HETs to save water without loss of flushing power. In fact, many perform better than standard toilets in consumer testing. Want proof? Watch this amazing video of Eddie Wilcut, the Water Conservation Manager for the City of San Antonio, flushing a Russet potato down a Caroma toilet with the full flush (1.6 gallon) AND half flush (0.8 gallon), which is meant for liquid waste.  

How Much Water and Money Do HETs Save?

High efficiency toilets save you money by reducing your water and wastewater costs. Over the course of a lifetime, an average person flushes the toilet nearly 140,000 times. If you install a WaterSense HET, you can save 4,000 gallons per year and your children can each save about a third of a million gallons during their lifetime. If a family of four replaces one 3.5 gpf toilet made between 1980 and 1994 with a WaterSense toilet, they can save $2,000 over the lifetime of the toilet. If the toilet being replaced was made before 1980, it uses 5 gallons per flush so the savings will be much greater. If you’d like to calculate how much water you can save try the water savings calculator on www.ecotransitions.com.

With these savings, new high-efficiency toilets can pay for themselves in only a few years. Even better, many local utilities offer substantial rebates for replacing old toilets with HETs. Detailed information on the rebates available in Georgia can be found here Rebates in Georgia

What are Dual Flush toilets?

Dual flush 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. They can save up to 40% (approx. 4600 gallons) compared to today’s standard 1.6-gallon single flush toilets. On an average of 4/1 uses a day,  Dual Flush toilets have the lowest water consumption of all - 0.96 Gallons per flush. Caroma, an Australian manufacturer that invented the Dual Flush technology manufactures award winning toilets that are both user friendly and, with a full 4″ trap way, virtually blockage-free!  Wouldn’t that be nice to be able to finally kiss the plunger good bye? Beware of some products reducing the amount of water flushed to use with your existing toilet. Existing bowls are not designed to perform with reduced amounts of water, so the likelihood of clogging your toilet while you are trying to flush paper and solid waste increases drastically.

 

Select a WaterSense Labeled High-Efficiency Toilet!

Whether you are remodeling a bathroom, beginning construction of a new house, or just want to replace an old, leaky toilet, a WaterSense labeled HET is your best bet. Look for the WaterSense label on any toilet you buy. If every home in the United States replaced just one old toilet with a new HET, we would save almost one trillion (spelled with a T) gallons of water per year, equal to more than two weeks of the water flowing over Niagara Falls!

Note that some manufacturers offer high-efficiency and ordinary models with very similar names, so be sure and look for the WaterSense label. A list of WaterSense labeled High-Efficiency Toilets can be found here List of WaterSense labeled HET’s published by the EPA.

Where can I find a HET?

To find WaterSense partners and resources in your area, please follow the link and click on your state below or choose from the list that follows. EPA - Where you live

For a watersavings calculator and more information on Dual Flush toilets please visit www.ecotransitions.com.


Edited by pottygirl - Thu, 19 Feb 2009 20:48:31 UTC
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#6
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There is a ton more information on HETs at GetWithGreen.com under the Bathroom section.  Lists of the various manufacturers, models and prices.   There is also a fun video that shows the flushing of sponges and golf balls down these toilets.

 

I personally have a Kohler Revival, and it is great!!!

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#7
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I am all for saving water, in fact I have a dual flush, and a 1.0 gpf fixture in my home. I don't particularly care for the dual flush since sometimes I underestimate the flush need(wanting to saves as much water as I can) and have to give a second full flush. In addition, the smaller water surface area makes for a smaller drop zone, and we all know what happens if you don't hit the drop zone. (Get the brush out and scrub the bowl.)

 

The other toilet is a no brainer, and for me and my family that is a beautiful thing!! No guess work, no brushing, and 1 gpf. I would recommend it to any family that find toilet training hard enough.

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