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Buildings that cool themselves and reuse their own water.
15 years of real projects. Learn how ↓

30/10/2026

Most hotels use their shower water once, then throw it away.

This hotel in Málaga doesn't.

They clean their shower water and use it to irrigate 100 m² of green wall.

That saves over 200,000 liters of water every year.
And the green wall cuts the energy use of the rooms by up to 30%.

Our colleague Alejandra explains how it works in the video.

Want to learn how to build Green Buildings? Comment Academy below to get the link!

Biotonomy – Nature Based Architecture

29/10/2026

If you've ever flushed a toilet, read this.

You flush it and the water goes away.
But it doesn't just disappear.

Huge pipes carry it for kilometres out of the city.
And then about 80% of it goes untreated into rivers and the sea.

A tree also makes waste - leaves, fruit, and water.
But its waste feeds everything around it.

So why can't a building do the same?

Well, it can! We have been doing it for the past 15 years in real projects.

Here's how it works:

1️⃣ The water from toilets and showers stays at the building.
2️⃣ Plants, bacteria and soil clean it, just like nature does.
3️⃣ The clean water feeds green walls, roofs and ponds.
4️⃣ The plants bring insects, and the insects bring birds and frogs.

Nothing changes for people. They use the same toilets and showers.
The only difference is what comes out of the pipe in the end.

When a building takes care of its own waste, it starts to act like a tree.
What it leaves behind brings life.

Only then can we say we've reached what people call "sustainable" development (FYI, we don't use that word).

Every building makes something.
The only question is: sewage, or life?

Want to learn how to build green buildings like this? Comment "Academy" below to get the link!

Biotonomy - Nature Based Architecture

28/10/2026

The first time, 15 years ago, we asked for permission to build a building that cleans its own water. It was denied.

We applied 6 more times. Every one was denied.

So we did it without permission.

The first projects were small, and many failed.
But every time, the water came out a little cleaner, until it was good enough to water plants.

Then we brought it to the city.
The permit was not easy - but we did not give up.

At Hotel Mariposa in Málaga Spain, we reuse the hotel's shower water to irrigate the green walls.

A local professor told us it would not work.
The soap and salts would kill the plants, they said.

But we built it anyway.

The plants grew so big that we have to harvest them.
This video is from one of those days.
These plants came off the wall and went to farms to start a new life.

Don't wait for permission to build what the world needs.
Sometimes the rules only change after someone shows it works.

♻️ Repost this so more people know reusing water is possible.

Biotonomy - Nature Based Architecture

27/10/2026

Every guest at this hotel in Madrid is also its gardener.
They just don't know it.

They take a shower in the morning.
The water goes down the drain like anywhere else.

But here, the drain doesn't lead to the sewer.
It leads to a tank, a filter and a pump,
and up to a 120 m² green wall on the front of the building.

Last month, about 500 hotel showers kept that wall alive.

Most hotels pay to bring in fresh water for their plants,
while they throw away millions of litres they already paid for.

Across Europe, that's about 160 million hotel showers a month.

We don't need more water.
We need to stop treating the water we have as rubbish.

Novotel in Madrid agreed to try it.
We put a meter on the wall, so every litre is counted:
almost 30,000 litres of shower water in one month.

That's about 6,000 showers a year,
from guests who never had to do a thing.

The best ideas don't ask people to behave better.
They make the right thing happen while people carry on as normal.

Want to learn how do build green walls with water recycling systems?
Comment Academy below to get the link!

Biotonomy - Nature Based Architecture

26/10/2026

A family of four throws away about 90,000 liters of shower water every year.
In the EU, that's almost 10 trillion liters.

At the same time, around a third of the EU's land runs short of water every year.

We waste clean water in the same places that are running out of it.

That makes no sense!

Shower water is barely dirty and easy to clean.
Still, in most buildings it goes into the same pipe as the toilet.

In a house we built in Austria in 2023, it goes into a garden instead.

▪️ The shower water flows into a long planter inside a greenhouse.
▪️ The roots and bacteria in the gravel clean it as it passes through.
▪️ The plants use that water to grow, so the showers water the garden.

The family sees a garden that produces fruits and vegetables.

In most buildings we design, the same system also flushes the toilets.
Just that can save up to 30% of a home's water.

We have been building this system for 15 years, and it has run without any technical problems.

Shower water should be used more than once before it leaves a building.

Want to learn how to build buildings like this? Comment "Academy below" to get the link.

Photos: Marco Mathis

Biotonomy - Nature Based Architecture

23/10/2026

Companies spend a lot of money to get people back to the office.

They give free lunches, ping-pong tables and team building workshops.

Four years ago, we turned this normal office in Spain into a natural workspace.

We installed green walls and planters next to the desks.

The plants are not the interesting part.
What’s interesting is what people do.

We were told that people in this office come in more and take fewer sick days.

We didn’t plan this. It happened because the space just feels better. And how people feel changes what they do more than any company policy.

So if you have an office, the question is not “can we afford making it a natural workspace?”

The question you should ask is “can we afford an office people don’t want to go to?”

In the video, our colleague Alejandra shows you how it works.

Everyone deserves an office they want to go to.

♻️ Repost this so your boss sees it.

22/10/2026

The more we work with water, the harder we find it to understand this.

Why are we working so hard to get rid of rain when we know we’re going to need water? How does that make sense?

After a big storm hit Copenhagen in 2011 and caused more than €800 million in damage, the city made an interesting comparison between two ways to manage heavy rain.

- The first was the conventional approach: adding more and bigger sewer pipes, which would cost about €2.7 billion.

- The second combined pipes with streets and parks that hold and manage rain, which would cost about €1.7 billion.

The option that gave water more space in the city was estimated to cost almost €1 billion less.

And the thinking behind it was simple: instead of only building bigger pipes to carry rain away, give it more places to collect and soak into the ground.

Green roofs help hold the rain and release it slowly, while rain gardens collect it in planted areas where suitable soil allows it to soak into the ground.

Instead of sending all that water away, we give it somewhere to stay close to where we need it.

This helps reduce flooding when it rains and keeps more water in the landscape for dry periods.

At BIOTONOMY, we design buildings and landscapes around a simple principle: keep water close to where it falls, and make use of it.

Every time we hear that we can’t afford greener cities, we wonder how much we’re already spending to work against nature.

Instead of letting all that water go to waste, we provide a place for it to stay—close to where we need it.

This helps reduce flooding when it rains and allows more water to be retained in the environment for periods of drought.

At Biotonomy, we design buildings and landscapes based on a simple principle: keep water close to where it falls and put it to use.

Whenever we hear that we cannot afford greener cities, we ask ourselves: how much are we already spending by working against nature?

♻️ If you want to learn how to design green buildings, comment "academy."

Biotonomy - Nature Based Architecture

21/10/2026

Back in 2008, this project changed how our founder, Moein Nodehi, thought about buildings.

He had studied engineering and architecture for 5 years, in 4 different countries.

No one ever taught him that buildings could clean their own water.

Then he went out into the real world.

In Africa, South America and Asia, he saw children and mothers drinking dirty water.

And one question stayed with him:

How come we know how to build entire cities and skyscrapers, but we don’t design buildings that provide clean water and reuse it?

Finding an answer became a mission.

Years of trying, failing and trying again followed.

Finally, in Lebanon, it worked.

Together with refugees and local builders, Moein helped build this building.

The building harvested water, filtered it for drinking, and used natural systems to clean wastewater for reuse.

The project received recognition from the United Nations.

Then came the next question:
How do we do this in cities?

At Biotonomy, we secured EU funding to build prototypes, put these ideas into practice, and received recognition in Spain.

Today, we work with hotels and cities to build circular water solutions.

And every project we design follows the same principle:

Water should be used more than once.

You don’t need to have all the answers to start.
But you need to care enough to keep trying.

♻️ If you think our buildings should do more with water, repost this.

Biotonomy – Nature Based Architecture

19/10/2026

A green wall is not something you install and forget.
It’s something you look after.

4 years ago, we planted a vertical garden on the façade of Hotel Mariposa in Malaga Spain.
Today we’re back for the annual pruning.

But here’s the part most people don't know …
Pruning is much more than cutting plants.

This is what we do, step by step:

1 - Remove dry leaves.
2 - Trim plants that grow up or toward the windows.
3 - Replant where needed.
4 - Clean the gutters.
5 - Check the pipes, so water reaches every plant.

It’s a full check-up.
Like taking your car in for its yearly service.

The result: a façade that is still alive, green and working after 4 years.

That’s what we do at Biotonomy .
We turn conventional buildings into green buildings.
And we stay to keep them alive.

Would you like a vertical garden on your façade? Tell me in the comments.

Biotonomy - Nature Based Architecture

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Fuengirola

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