Best Methods and Adapters for Recycling Sink Water into Toilet Flushing System

Question

I would like to modify the sink drain so that the water after washing from the sink flows into the water tank into the toilet bowl and is ready for flushing the toilet. What is the best way to do this and what adapters should I use?

palmus · Accepted Answer

Look for a shower siphon. It is the shallowest possible. Sink siphons have small diameter outlets for washing machine drains. And even if you give up on it and plug the hole to the sewage system, you will still have a problem with sealing the sink drain. Another problem is entering the cistern through such a small hole. And one more thing is the negligible level difference. Go to the DIY store and play with siphons and sinks. Maybe something will come to your mind.

tomtim123 · Accepted Answer

And my proposal is this. Set the float in the cistern so that the valve closes the flow of clean water halfway. Connect the hose from under the sink to the cistern and this way the second half of the cistern will be filled with dirty water from the sink. If there is more water from the sink, it will flow into the bowl and that's it. That's my proposition.

ta_tar · Answer

It will probably be an installation that will not save you anything. If you use the toilet normally, the flush tank is always full of water. If you connect the sink to a full tank, the water will overflow and flow into the bowl anyway. Unless you only use the sink to fill it, what will you do when the tank is empty because no one has used the sink and you need to rinse the bowl?

LA72 · Answer

And how are you going to force the water to move upwards from the washbasin siphon? Pump = power consumption.

Krzysztof Kamienski · Answer

Install the shitter in the basement and let gravity do the rest, or place the throne royally - on a platform, and then use a ladder, like a certain politician.

also · Answer

I think the best solution would be to collect rainwater from the roof from the gutters. You install a 3,000 liter tank in the attic and connect it to the toilet installation. You collect water from gutters. A friend has a similar solution. He waters the garden with water from the gutters, washes the car, etc. Everything is free :D

In your case, to make it effective, you would have to connect the sewage from the shower and sink and place the tank somewhere lower. Pump water from the \tank to the toilet tank. Not very profitable. A person shits once a day + pees a maximum of 5 times. This gives a maximum of 18 liters of water. Times 30 days gives 540 liters. That's about PLN 7 savings per month. It's better not to wash anymore, because a shower takes 70 liters of water

. You can also convince your wife to take a shower with you so as not to waste water. For each such joint washing, you will save 70 liters.

8850 · Answer

@ta_tar: if you look at the photo, there is a pipe sticking out of the wall with a closed cold water supply to the toilet tank. Just turn off the water supply and pour dirty water from the sink into the tank.

I don't have access to the roof, I'm only interested in installing a sink and flush at the moment. In the photo below I have marked the water level of the overflow element. Is there any?/ Can I use a pipe reduction running under the washbasin to the siphon and then through a hose, e.g. a garden hose, into the toilet tank. Water from the hose under the washbasin can enter the cistern tank through the plug on the left side of the cistern. On the right side, instead of a cap, cold water from the water supply is connected. It looks like you don't need to use any pump based on the water level.

Zbych034 · Answer

This solution results in very dirty toilets. This may be unacceptable.

Krzysztof Kamienski · Answer

Maybe not, he will have to wash his toilet bowl . But seriously, after using the sink for a long time, what will it do with the excess water? A three-way float valve would have to be used to direct excess water into the sewage system when the tank is full.

palmus · Answer

As far as I remember, there is an overflow in the cisterns. The excess will flow into the sewer.

8850 · Answer

Modern and cheap toilet cisterns have an overflow valve because I have it inside and I can see that everything that is above the level of the red line drawn in the photo goes down to be flushed and it is a protection against flooding the bathroom, so I am not afraid of overfilling the tank or cleaning it manually. water control.

Water used for washing hands or toilets is not as dirty as you write. The fact that there will be sediment in the tank above the bowl doesn't bother me, I can't see it, apart from that you can open it and scrub it, remove the tank cover in 5 seconds, I can even pour the mole into this solution - 15 seconds once every six months and leave it overnight. So what water/pipe reduction should be used to connect them together and direct water from under the sink to the tank?

Zbych034 · Answer

Unfortunately, you have a ceramic tank. Inserting a tube into it will be difficult. It would be easier with a plastic tank.

palmus · Answer

If he is not afraid, he will buy a diamond crown for PLN 15, carve a second hole next to it or lower and insert a white PVC diameter of 32 mm into the tank.

Tommy82 · Answer

These tanks sometimes have holes on both sides, so just switch the filling valve, add a longer hose and use the hole.

However, the only profit here will be that you will wash your hands after two, because after one you may not have time before the tank is filled, greater savings if you don't have one, it will give you a drain with two portions of water and a slight reduction in the water level in the cistern.

Kaszpir77 · Answer

I confirm The neighbor tested it and gave up. Soap deposits caused terrible proverbial mess, especially in the tank, where most of them accumulated. Someone wrote about a 3000l rainwater tank in the attic - before building it, check whether the attic can withstand an additional 3 tons and placed quite point-wise.

Tommy82 · Answer

If the water is hard, poorly soluble calcium soaps will form. Soft water should be easier. However, dirt, hair, etc. may clog the trigger seal.

Another problem is that it may turn out that new life will arise in a tank periodically fed with dirty water

.

Anonymous · Answer

The capacity of the cistern is 6 to 10 liters.
For 6 liters of 1 m³ capacity, it is 166 flushes, which, considering the water cost of approximately PLN 10/m³, gives 6 groszy per flush.
I didn't count, but if a family of four flushes 20 times a day, the cost of this activity will be PLN 1.20 per day! Only PLN 1.20!

Now another calculation: like everyone else at home, I have a TV that doesn't turn on for almost a month. The RTV subscription fee is PLN 22.70/month and a satellite decoder is PLN 68/month. Total approximately PLN 90 per month. The subscription itself gives 378 flushes, and with the decoder it is equal to 1,500 flushes. Each member of a four-person family could pay PLN 1,500/4 = 375 times a month for this TV set. For the TV itself!

One beer costs - well, PLN 2.50. For this beer, - based on the above calculations, you can flush yourself 41 times!
I know you don't drink beer, but a bad bun is also 2 zlotys....

8850 · Answer

This bowl tank has two holes, one on the left side is plugged, the other one supplies clean cold water from the pipes.

When I read my friend's calculations regarding the price of water, discharging cold clean water into the canal is actually not as expensive as it seems.

palmus · Answer

You are undoubtedly right. It's like rainwater for watering and many others. If a boy wants to do scientific research, let him do it (as long as he publishes it here someday). And research always costs money. Does it make economic sense? That's a completely different matter. As a side note: regarding the TV and others: I installed a timer on the power strip because the TV, router, modem and HDMI switch together consumed over 5A. The timer cost almost PLN 3.00. Refund? I didn't count. But this 5A flows only for 10 hours a day instead of 24.

ta_tar · Answer

You probably didn't read the rest of my statement.

8850 · Answer

@ta_tar: simply, when there is no water, I will manually open the water valve to fill it, the valve is located in the photo next to the tank

Tommy82 · Answer

So replace it immediately, because these valves tend to die when they are used, if not, too ;)

I would suggest a ball valve with a longer lever, much more comfortable and durable. These valves with plastic handles are crap, they are simply programmed one turn too many.

misiek1111 · Answer

But women twice as much.

Tommy82 · Answer

@misiek1111 Well, I was wondering if all these Instagram models ever defecate

palmus · Answer

Princess never. I bet that halfway through the plumbing work you will give up on the idea. Or after the first time cleaning the cistern from the stinking slime...

arekb81 · Answer

Why mess around when there are ready-made solutions? Link

tomtim123 · Answer

I don't know if my friend noticed, but a bigger and more expensive solution is to replace and modify the entire installation, including the tiles and renovation, to a ready-made one like the one in the link you posted. But we leave the decision to the author. Regards

kmr · Answer

The case is unprofitable for now, but: - water prices will definitely increase - may be important if you have a septic tank generally available topic under the slogan gray water

misiekpb · Answer

I will also add that in the case of hard water, the toilet will become covered with stones from constant overflowing. And the drain from the bowl will gradually narrow due to the growing scale and other sediments due to the slow flow of gray water.

[Solved] Best Methods and Adapters for Recycling Sink Water into Toilet Flushing System

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