I Made a Toilet Tank Sink!
Intro: I Made a Toilet Tank Sink!
I made a sink that goes on top of your toilet. When you flush, the fill water is re-routed to a faucet (don't worry, it's perfectly clean). Wash your hands like normal, then watch the water drain directly into the toilet tank. Next time you use the bathroom, the recycled water flushes the toilet and clean water is dispensed from the faucet. The design saves an estimated 1 gallon of water per person, per day! No modifications are made to the toilet except for routing the fill water tube into the bottom of the faucet.
STEP 1: Design
I saw this idea a long time ago when looking into Japanese toilet technology. I finally decided to make my own out of concrete. I used sketchup to get the dimensions, then made a mold of my tank lid using silicone rubber. The shelf shape was inspired by JON-A-TRON's instructable.
STEP 2: Experimenting With the Form.
I wasn't sure if you could just press a sink shape into wet concrete, so I didn't have high hopes for this first pour. I used Quikrete countertop mix.
STEP 3: Air Bubbles.
I quickly learned that air bubbles need somewhere to go when you pour concrete. Whoops. Otherwise the it set up nicely and was really strong.
STEP 4: Grind. Fill. Polish.
After grinding the air bubbles mostly out, I used Henry's feather finish to fill all the holes. Then I sanded down to 400 grit before finishing with a concrete water sealant.
STEP 5: Plumbing.
The plumbing for this project was really simple. Just hook up that black tube that normally fills your tank into the bottom of the faucet. I used an assortment of brass fittings to go from 3/16 barb to 3/8 thread.
STEP 6: Finished.
I'm thrilled with the finished product. The concrete looks great and it's extremely functional. You have lots of time to wash your hands after flushing so there's no rush.
18 Comments
Yonatan24 7 years ago
Nice! The water should slowly polish the sink and make it super smooth :)
Let me see if I understood:
You wash your hands.
The water from washing your hands goes to the tank.
You flush the toilet.
Water that's in the tank (that came from the sink) goes into the toilet.
That water goes into the sewer.
Correct?
amcgamcg 7 years ago
I think it's the other way around: the tank water is syphoned UP into
the tap then dropped back into the tank after washing your hands. This
is why the creator spoke about his friends hesitating about using water
"from the toilet tank" which is understandable (the hesitating) though
unjustified. I guess the hesitation comes from not being able to wash
the insides of the toilet tank, and the fact that the inside of a toilet
tank is matt, so easily invaded by germs, and not available for daily
cleaning...
csorrows 6 years ago
JasonK181 7 years ago
amcgamcg 7 years ago
I see now, and I am rightly corrected! Thanks! I love the idea and the way it is exposed.
Yonatan24 7 years ago
I see... And I have to admit that it is kind of disgusting! :)
ScavengerHack 7 years ago
The other commenter was the one which was "incorrect".
Leei1337 7 years ago
simplymedc 7 years ago
Very cool! Love this idea - good job!
CharlesJ50 7 years ago
amcgamcg 7 years ago
Thanks for helping me to understand. In fact it works exactly like the new French system in recent blocks of flats, but unfortunately not all of them!
ruso_cj 7 years ago
Great idea!!
amcgamcg 7 years ago
That is brilliant. You're lucky to live in America where you can get those DIY products, and clever to try your hand with them successfully. In France we can find little sinks on top of toilets in the most recent flats and houses: their use is upside down to yours; you wash your hands and the soapy water is collected in the tank ready for flushing with. Same difference, but this way you don't get the hesitations about using water that has sat in the actual TANK for some time (I agree this water is clean, but somehow I understand people's hesitations. These may come from the fact that there are blue salt lumps you can place in the tank...? The closeness of the tank water to the drain...? The fact that people don't clean the inside of the tank...? Anyway, thanks for that!!!
CharlesJ50 7 years ago
Truck Knight 7 years ago
blkhawk 7 years ago
Well done! I like your use of concrete. This project not only will last a long time, it will also save you money.
gm280 7 years ago
I like that idea. I can see somebody marketing such a device to help save on water. Sinks that drain into tolet tanks to reuse for flushing is a great idea. Thumbs up!
BeachsideHank 7 years ago
This is just so brilliantly commonsense that it must be against all plumbing codes. ☺