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Saving Water with the Toilet Sink Combo

I love everything weird and colorful in this world and I try to live a life that will make the world a little better once I'm gone.


Go Green with Water Efficiency!

Anyone trying to go green, should have onserving water pretty high on their agenda. An easy way to do this is to combine your sink with your toilet (and by that I do NOT mean peeing in the sink!). This more efficient system uses the same water to wash your hands and flush the toilet. You can save water each time you flush!

This improved system has been used in Japan for some time, and is now available for you!

An added benefit to this system is that you can now put a sink into very small bathrooms that could not fit one before and still be able to wash your hands.

The Sinkpositive Sink/Toilet Combo - Go Green with Toilet Efficiency


SinkPositive is a toilet accessory that retrofits nearly any existing toilet into a toilet-sink combo unit. No need to call a plumber - YOU can install this unit in just a couple minutes and you don't even need any tools to do it.

The fact of the matter is that your toilet, as it now sits, uses perfectly clean water to flush with. This water is as sanitary as the water coming out of the sink. The benefits of this combination unit are plenty and prove, as units like these are being widely used in Japan.

The system is simple, when the toilet is flushed the water pumps up through the pipe to the sink, automatically turning the sink on and drains down to the bowl. The sink will turn off automatically.

How It Works - Watch a Video of the Toilet Sink in Action

Do You Conserve Water?

The Benefits of the Toilet Sink

8 Reasons This Thing is Just Great

  • The same water is used for flushing and washing allowing you to save water - helping the environment.
  • In parts of the world where water is scarce, using the same water for flushing and washing encourages hand washing which is overlooked so the water can be used for something else.
  • A tiny bathroom that only has a toilet can now have a toilet and a sink!
  • You just might save a few pennies on your water bill.
  • The sink turns itself reminding the user to wash their hands (especially good for children).
  • Because it turns off when the toilet no longer needs it on, a water leak in the system is easily detected (when the sink runs and runs)
  • Because the sink turns itself on and off, there is no need to touch the knobs which are often covered in germs, and also difficult for people with arthritis or other physical conditions.
  • Homes with well water can save water as well as the electricity needed to pump it.

The SinkPositive Toilet Sink

Washing Hands

Washing Hands has been shown to be the number one way to improve personal health and reduce disease transmission.(United States Centers of

Disease Control and Prevention)

Tips on How to Conserve Water - What YOU can do to conserve

Learn other ways you can save water in your home and activities.

The Sink Twice

SinkTwice also makes a toilet sink but it has a few differences worth noting before buying this one. This toilet sink fits a smaller tank. If your tank is over 16.8", it simply won't fit properly and you will need to buy an additional expansion kit (sold seperatly). Also, the bay of the sink is smaller and set off to the right. In some rooms this may be fine, but if the easier to access corner is the left, then this may be annoying.

So, consider your choices. Overall this is also a very well made sink and will save you water for years. I really like the style of this one looking more domestic and less dental office.

The Sink Twice

For The Do-It-Yourselfer - DIY: How to Make a Your Own Combo Unit

If you are more likely build one than to buy one, there are instructions available online as to how to make your own toilet sink top device.

What are your thoughts on the toilet/sink combo?

Scroll to Continue

Would you use a Sink/Toilet Combo?

If someone gave you one, would you use a Sink/Toilet Combo?


Kerri Bee (author) from Upstate, NY on February 28, 2019:

It is sold through Amazon. Click the link for details. Thanks!

Tony Robin Bulley on February 26, 2019:

Great do you export the sink over toilet what is the cost of sending by air freight

Im in New Zealand

maddalena11 on July 02, 2014:

I am very interested to buy this toilet sink combo. Where can I buy it .


dwelburn on February 11, 2014:

This is a brilliant idea. I never would have thought of it. I guess you could also adjust your plumbing so that your normal sink flows into your toilet cistern.

sierradawn lm on January 06, 2014:

Sounds like a most excellent idea!

anonymous on July 19, 2013:

We're adding a second toilet in closet and wanted to include a small sink on top. Thanks for the info!

geosum on May 14, 2013:

Great concept. I was looking into saving up water from the sink and tub for watering my garden years ago.

PurplePansy LM on April 21, 2013:

What an interesting concept! I've never heard of this idea before. If I can understand how this works, I might just want one.

bluelily lm on April 10, 2013:

Wow! what an innovative idea, wastage water doesn't go waste.

TapIn2U on April 05, 2013:

Would love to try it! Great lens! Sundae ;-)

john9229 on April 02, 2013:

I didn't know about this. I should give it a try.

katiecolette on March 08, 2013:

Never heard of this before. What a cool idea!

uneasywriter lm on February 26, 2013:

Different way to conserve water. Never seen this before.. Makes some sense.

anonymous on February 09, 2013:

I bought this a year ago and it has been great. Hopefully I can clear up some misconceptions. First the water is clean from the tap and then goes into the bowl, bypassing the tank. At least if it is installed correctly. No, you don't want to use it for brushing your teeth or non-toileting washing up. You would be wasting water. If you feel you want to further conserve water you can use it to brush your teeth, you just need to be quick enough to grab the toothbrush after washing your hands and probably a cup to catch water for rinsing. That is for the diehards though. Soap scum can be a problem in the bowl, but that can be quickly brushed away with cleaner and a brush. I have a bigger problem with mineral deposits that require soaking.

Cold water can take time to get used to. I have arthritis on occasion, but it hasn't been an issue with this sink. Few people realize that the CDC recommends washing your hands with cold water as hot water strips your hands of their protective oils and allows bacteria to get a foothold. It is actually great to promote hygiene. Do what you are comfortable with, but try to get the facts first.

Kerri Bee (author) from Upstate, NY on January 08, 2013:

@anonymous: I've heard you should squat, but I've also heard that older people who have squatted all their lives and now have hip problems also have problems with bowel movements because they can't get into the squatting position and their body won't make a bowel movement any other way.

As far as Elvis goes, it seems right that the King should die on the throne!

anonymous on January 08, 2013:

I flush with bath/shower water . Zero clean water for toilet. I am also experienced at having no toilet.. Everyone should be aware that the toilet seat is extremely unhealthy The body was never designed to sit...just squat. Sitting can and does cause bowel disease and heart attacks. Elvis died on the throne . His death may have been toilet seat syndrome with or without the drugs.

jmatts1 on November 29, 2012:

Very interesting concept I hadn't seen before. Conserve water and save space. If you get a chance check out my new lens on bottle-less water coolers:

Seth from California on November 26, 2012:

Very cool idea.

joehelms on August 20, 2012:

Cool idea. I would be concerned with splashing and getting water everywhere though, unless you had tile walls or something.

OliviaQ on July 28, 2012:

very nice lens that share about toilet. there aidea could I get from here :)

anonymous on July 23, 2012:

What a cool idea for conserving water and going a little greener and a great idea for those with small spaces. Most of us in the US are still getting used to the idea of using brown water for flushing, we've gotten used to seeing that sparkling clean toilet bowl. You make a good point about those in the country paying to pump the water but also, in the city you pay not only for the water coming in, but also for the water going out as sewage.

Sher Ritchie on July 22, 2012:

It's an amazing invention - like nearly all great inventions its so simple one wonders why it wasn't created years ago! I've put a link to your lens on mine: . Thanks for sharing!

YogaAngel on June 30, 2012:

Thank you for clarifying that I won't have to pee in the sink

hntrssthmpsn on June 10, 2012:

Awesome! I had no idea there *was* such a thing as a toilet/sink combo. An ecologically sound alternative... with the potential for some fabulous fun with uninitiated guests!

microfarmproject on June 10, 2012:

Interesting idea. I wonder if it will catch on in the U.S. I will be looking into this concept more. Thanks!

Elsie Hagley from New Zealand on June 06, 2012:

Love this lens. Thanks for sharing with us, I did not know this was available in Japan, but a excellence idea. Blessed

KittySmith on June 05, 2012:

@JohannDog: Ya, now it wouldn't be as gross to find you drinking from the toilet now, eh Johann?

KittySmith on June 05, 2012:

I think the china option in the Amazon module looks much better, it would definitely be a great idea for a tiny home.

Erin Hardison from Memphis, TN on June 05, 2012:

Pretty brilliant idea, actually. Might try a toilet/sink combo if I could get the rest of my family to go for it.

Ramona from Arkansas on June 05, 2012:

I agree. With pinkrenegade, this should be used in every home. Wouldn't be a bad idea to have in schools to teach the children to wash hands as soon as finished using the bathroom.

Pastor Kay on May 13, 2012:

I've been in a few little bathrooms I wished had one of these!

hessa johnson on April 15, 2012:

I used this type of toilet all the time in Japan. It's such a great idea, I don't know why it's not more commonly seen. Thanks for a great lens.

anonymous on March 31, 2012:

I think this combo idea makes sense, unlike a combo I've seen with a refrigerator, electric stove & sink - that was both crazy & dangerous :(

Gloria Freeman from Alabama USA on March 31, 2012:

Hi I like this,we all need to do our part to save water.I do all that I can.Thanks for sharing.

Brandi from Maryland on January 28, 2012:

Great lens! Water conservation is a very important subject...thanks for bringing it to light! :)

Johann The Dog from Northeast Georgia on January 15, 2012:

Well wadda ya know? This is very interesting. We're (Mum and I) are always looking for more ways to be green. Thanks for the info!

Renaissance Woman from Colorado on December 29, 2011:

A very interesting concept. I'm all for water conservation. It's our most precious natural resource.

TransplantedSoul on November 19, 2011:

I love this idea! I featured your lense here: Toilet Replacement Guide

anonymous on November 10, 2011:

I need one of these for a small toilet room in my student house. In order to get the HMO licence I need to install a sink in the little toilet room. Where can I buy one? How much? cheers scott

AtoZPlumbingToronto on October 01, 2011:

I'd say, whatever help water conservation is a worthy idea.

We have lots of water in Canada and did not learn to appreciate it ...yet.

But the way the world is going, we certrainly will have to.

adamfrench on September 28, 2011:

Impressive lens, thumbs up

Blackspaniel1 on September 04, 2011:

I'll pass.

Frankie Kangas from California on August 13, 2011:

Good idea for saving water. We waste so much even when we try to conserve. Thanks for sharing. Blessed. Bear hugs, Frankster

dahlia369 on August 11, 2011:

I just love the imagination without limits. Blessed! :)

Mary Crowther from Havre de Grace on August 05, 2011:

Interesting lens! Never knew there was such a thing!

anonymous on August 02, 2011:

Like the idea...but wouldn't just leaving the lid off altogether and dipping your hands to rinse them do the same thing?

phoenix arizona f on July 26, 2011:

Great idea!

Kerri Bee (author) from Upstate, NY on July 18, 2011:

@anonymous: Actually, according to the FDA, hot water comfortable enough for washing hands is not hot enough to kill bacteria (source).

anonymous on July 18, 2011:

no hot water to wash with, not very sanitary, and if you only want to wash your hands you have to flush first and waste even more water You would still need a sink for shaving and bushing your teeth or do you just keep flushing to get the water to do this with?

Dalmain on June 10, 2011:

Currently, I recycle and reuse whatever I can ... and I'm always looking for additional options.

Thanks much for the share ... 8o)

Rhonda Albom from New Zealand on May 10, 2011:

Interesting. Thanks for drawing attention to this interesting sink. I am glad that it wasn't a sink that you use as a toilet. :)

Linda Hahn from California on May 08, 2011:

Go green!

solutionism on April 03, 2011:

Love your lens! Keep it up!

anonymous on February 27, 2011:

adding u to water crisis lens and blessings from a squid angel :)

benharper on February 13, 2011:

I live in a desert, i know the importance of water Please check out myirrigation and sprinkler services

gravityx9 on January 31, 2011:

Super Lens! I have featured it with my Earth Lens 'It's Good To Be Green' ! THUMBS UP *SEE IT HERE*

Kerri Bee (author) from Upstate, NY on December 08, 2010:

@anonymous: What is your concern about legality?

anonymous on December 08, 2010:

Interesting idea. I wonder about the legality of it here in California.

anonymous on October 22, 2010:

What a cool concept! You could really elaborate on this too by getting some really cool

Karen from U.S. on October 04, 2010:

I've never heard of this before, and it makes good sense. I wonder how well it would work in public restrooms.

K Bechand from NY on September 17, 2010:

I love most of your stuff ... but this is just odd to me ! lol

anonymous on July 03, 2010:

Interesting lens you have here! Keep it up!

Susan Deppner from Arkansas USA on May 14, 2010:

I think this clever device makes perfect sense!

monarch13 on April 22, 2010:

I had never seen this before, how clever. Happy Earth Day!

anonymous on November 04, 2009:

Best price I've found for this product is at for only $89.00

anonymous on November 04, 2009:

What a brilliant idea! The lens has great info and is very well laid out. Blessings for you from a "green" Angel!

anonymous on October 24, 2009:

If you tell your kids, they have to poo or pee, to save water and wash their hands, they will be devouring more junk food to keep their hands and the earth cleaner!

religions7 on July 19, 2009:

Thanks for educating the world and contributing to environmental awareness and changing lifestyle. This lens is featured on my Environment lensography - perhaps you want to sport the badge?

RolandTumble on March 11, 2009:

Great lens. 5* & lensrolled to my eco-lens.

greenerme on January 13, 2009:

This is an interesting product! Hopefully this will catch on more and more over time. Welcome to A Million Ways to Go Green!

Paula Atwell from Cleveland, OH on September 18, 2008:

Really interesting. Welcome to the Living the Green Organic Lifestyle Group.

religions7 on June 12, 2008:

Great lens. I featured it on my new lensography on the environment. Go check it out and add your favorite environment links to the plexo:

There's also a duel about the question: is the environment more important, or the economy?

Evelyn Saenz from Royalton on April 19, 2008:

What a great lens! 5 stars and Favored!

The Purple Gallinulesloved your lens so much that they are sending you some virtual Raindrops to fall gently on your garden.

NorDac LM on February 03, 2008:

Tell your young kids (at least boys) that the water is being recycled form the toilet and you might even get them to wash their hands once in a while. :)

Nathalie Roy from France (Canadian expat) on January 29, 2008:

Welcome to theEcological shopping group 5/5!

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