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Saving Water with the Toilet Sink Combo

Updated on August 23, 2017

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?

Do you make an effort to conserve water in your home?

See results

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


With each flush of your commode, clean water that would otherwise go straight down the toilet is first routed up through a chrome gooseneck spigot to dispense pure water for hand washing. The Toilet Lid Sink installs easily without tools, is attractive for any bathroom and is a great space saver. Shuts off automatically. Porcelain-like white plastic replaces your existing tank top and adjusts to fit standard toilets up to 8in wide and 18-22in long. Built-in soap dish. Overhang varies up to 1.5 in.


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.

Would you use a Sink/Toilet Combo?

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

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.

Base for Caroma Delux

Caroma 609151W Royale 305 Round Front Toilet Bowl, White
Caroma 609151W Royale 305 Round Front Toilet Bowl, White

Vitreous China toilet base that fits with toilet sink above.


What are your thoughts on the toilet/sink combo?


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    • profile image

      maddalena11 3 years ago

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


    • profile image

      dwelburn 4 years ago

      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 profile image

      sierradawn lm 4 years ago

      Sounds like a most excellent idea!

    • profile image

      anonymous 4 years ago

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

    • geosum profile image

      geosum 4 years ago

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

    • PurplePansy LM profile image

      PurplePansy LM 5 years ago

      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 profile image

      bluelily lm 5 years ago

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

    • TapIn2U profile image

      TapIn2U 5 years ago

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

    • profile image

      john9229 5 years ago

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

    • katiecolette profile image

      katiecolette 5 years ago

      Never heard of this before. What a cool idea!

    • uneasywriter lm profile image

      uneasywriter lm 5 years ago

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

    • profile image

      anonymous 5 years ago

      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.

    • profile image

      anonymous 5 years ago

      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.

    • kerbev profile image

      kab 5 years ago from Upstate, NY

      @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!

    • profile image

      jmatts1 5 years ago

      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 Shafer profile image

      Seth 5 years ago from California

      Very cool idea.

    • cmanning08 profile image

      cmanning08 5 years ago

      It is a good idea!

    • JonoAdams profile image

      JonoAdams 5 years ago

      Very interesting, thanks for sharing this lens!

    • joehelms profile image

      joehelms 5 years ago

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

    • OliviaQ profile image

      OliviaQ 5 years ago

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

    • profile image

      anonymous 5 years ago

      Interesting lens. Thanks for sharing.

    • profile image

      anonymous 5 years ago

      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 profile image

      Sher Ritchie 5 years ago

      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 profile image

      YogaAngel 5 years ago

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

    • hntrssthmpsn profile image

      hntrssthmpsn 5 years ago

      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 profile image

      microfarmproject 5 years ago

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

    • Elsie Hagley profile image

      Elsie Hagley 5 years ago from New Zealand

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

    • tslizzy profile image

      tslizzy 5 years ago

      love the idea.

    • KittySmith profile image

      KittySmith 5 years ago

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

    • KittySmith profile image

      KittySmith 5 years ago

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

    • LovelyMom77 profile image

      LovelyMom77 5 years ago

      I like the idea, consumption is ideally kept to a minimal!! Great concept.

    • BunnyFabulous profile image

      BunnyFabulous 5 years ago from Central Florida

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

    • ramonabeckbritman profile image

      Ramona 5 years ago from Arkansas

      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.

    • pinkrenegade lm profile image

      pinkrenegade lm 5 years ago

      Great lens. This should be used in every home.

    • PastorKay profile image

      Pastor Kay 5 years ago

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

    • hessa johnson profile image

      hessa johnson 6 years ago

      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.

    • profile image

      anonymous 6 years ago

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

    • flinnie lm profile image

      Gloria Freeman 6 years ago from Alabama USA

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

    • Brandi Bush profile image

      Brandi 6 years ago from Maryland

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

    • JohannDog profile image

      Johann The Dog 6 years ago from Northeast Georgia

      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!

    • Diana Wenzel profile image

      Renaissance Woman 6 years ago from Colorado

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

    • TransplantedSoul profile image

      TransplantedSoul 6 years ago

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

    • profile image

      anonymous 6 years ago

      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

    • profile image

      AtoZPlumbingToronto 6 years ago

      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 profile image

      adamfrench 6 years ago

      Impressive lens, thumbs up

    • Blackspaniel1 profile image

      Blackspaniel1 6 years ago

      I'll pass.

    • Franksterk profile image

      Frankie Kangas 6 years ago from California

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

    • dahlia369 profile image

      dahlia369 6 years ago

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

    • Mary Crowther profile image

      Mary Crowther 6 years ago from Havre de Grace

      Interesting lens! Never knew there was such a thing!

    • profile image

      anonymous 6 years ago

      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 profile image

      phoenix arizona f 6 years ago

      Great idea!

    • kerbev profile image

      kab 6 years ago from Upstate, NY

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

    • profile image

      anonymous 6 years ago

      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?

    • profile image

      Dalmain 6 years ago

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

      Thanks much for the share ... 8o)

    • RhondaAlbom profile image

      Rhonda Albom 6 years ago from New Zealand

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

    • linhah lm profile image

      Linda Hahn 6 years ago from California

      Go green!

    • solutionism profile image

      solutionism 7 years ago

      Love your lens! Keep it up!

    • profile image

      anonymous 7 years ago

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

    • profile image

      benharper 7 years ago

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

    • profile image

      gravityx9 7 years ago

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

    • kerbev profile image

      kab 7 years ago from Upstate, NY

      @anonymous: What is your concern about legality?

    • profile image

      anonymous 7 years ago

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

    • profile image

      anonymous 7 years ago

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

    • KarenHC profile image

      Karen 7 years ago from U.S.

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

    • bechand profile image

      bechand 7 years ago

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

    • profile image

      anonymous 7 years ago

      Interesting lens you have here! Keep it up!

    • SusanDeppner profile image

      Susan Deppner 7 years ago from Arkansas USA

      I think this clever device makes perfect sense!

    • monarch13 profile image

      monarch13 8 years ago

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

    • profile image

      anonymous 8 years ago

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

    • profile image

      anonymous 8 years ago

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

    • profile image

      anonymous 8 years ago

      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 profile image

      religions7 8 years ago

      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 profile image

      RolandTumble 9 years ago

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

    • greenerme profile image

      greenerme 9 years ago

      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 profile image

      Paula Atwell 9 years ago from Cleveland, OH

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

    • religions7 profile image

      religions7 9 years ago

      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?

    • evelynsaenz1 profile image

      Evelyn Saenz 10 years ago from Royalton

      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 profile image

      NorDac LM 10 years ago

      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. :)

    • FanfrelucheHubs profile image

      Nathalie Roy 10 years ago from France (Canadian expat)

      Welcome to theEcological shopping group 5/5!