Clewat Ltd

Clewat is a fast growing cleantech company from Finland, focusing on solving the plastic waste, excess biomass, oil spills and other pollution problems of our oceans, seas, rivers and lakes.

There are currently over 150 million tons of plastic waste in the sea, and the amount is rising by 10 million tons every year.


If we continue littering at the current pace there will be more plastic garbage in our seas by 2050 than fish.

At Clewat, we take care of the development of nature on a daily basis and our mission is to make our seas non-plastic with a marine cleaning device developed by our innovator Johannes Myllykoski. 

“After the oil disaster in the Gulf of Mexico in 2010, I realized that there are still not good enough solutions to tackle the environmental problems of the sea. I realized I wanted to influence: make a device that collects oil properly. 

It started with years of development work, during which I was advised that, why wouldn’t you do, with the same effort, a device that would also collect plastic garbage. I realized that utilizing the sea’s flow, it is possible to find a solution that would effectively improve both serious problems. 

As the father of five children, the size of the plastic waste problem has been shocking information. It got me thinking that something must be done. In the future I want that my children could also enjoy the pure nature.” 

-Johannes Myllykoski

Our goals are high

The device did not come easy. Myllykoski has devoted thousands of hours to developing it. However, a small prototype has grown in less than ten years a device that is already operational. 

Myllykoski has also been able to get recognition for his work, he won the Baltic Sea project’s first prize with his invention in 2018.

Clewat is a Finnish, internationally operating company, focusing on environmental technology, whose journey is just beginning.

Clewat Team


Marko is the Chief Commercial Officer of Clewat and experienced recycling professional.

Marko has three decades of experience in recycling, waste management, marketing, branding, sales and load handling industry in Europe, China, South East Asia and Americas, having worked on multiple projects Globally.

In his free time Marko enjoys scuba diving, downhill skiing and classical music.


Janne, Executive Chairman of Clewat, is a former investment banker and current investor and environmental activist.

Janne has a long history of bringing new solutions to the market in a major way. Janne has worked in senior positions in Nordea, Danske and Sampo Groups. He has also founded a stock-market-listed company and participated in building a mobile solution with more than 20 million users worldwide.

Janne loves improving awareness on and participating in solving the key issues of the globe with help of responsible and sustainable market economy. Nature, family, creating new successes and continuous learning are all close to heart to Janne, especially after a health issue six years ago, where his heart literally stopped working.


Keijo is the Clewat's CEO and business expert with excellent team skills.

Previously, Keijo has worked as Sampo Bank’s Bank Manager, Mandatum Life’s Corporate Sales Director and CEO of Hartwall Arena and the ice hockey team Jokers in Helsinki.

Keijo is a former professional hockey player. He has represented Finland at the Albertville 1992 Olympics and achieved Finland's first medal in hockey by winning silver in 1992 world championships.


Hannu is the Clewat's COO and a long-time entrepreneur who has been involved in founding and building several companies

What Hannu doesn’t know, he learns. Hannu has previously worked in a wide range of everything from Technical Leader to the Chief Executive. During his career, Hannu has been building and designing more than one thousand fitness center in Finland.

In his spare time, Hannu works out in the gym, and he also enjoys floorball and cross-country skiing.


Johannes is the Founder and Chief Innovator of the company.

In his previous work Johannes has been involved in the testing of oil spill response equipment at Blaxar Oy and has been developing and streamlining industrial production lines. Johannes’s strengths are product development and metal finishing.

Johannes loves fishing, hiking and wildlife. In his work he was inspired by the idea, that also in the future, it would be possible get fish fresh from the sea.


Katja is an Environmental Expert of Clewat, who has specialized in plastic and recycling.

Katja has special knowledge of plastics, recycling, marine litter and from sales. She speaks Russian, Greek and Swedish.

Katja loves to cooperate with foreign clients and partners. She has written a non-fiction book, which tells about sustainable travelling and the environmental problems in our planet - not forgetting marine litter.

Katja belongs to the oil spills response team of WWF and is supporting the life of tigers.


Stjepan is a marine biologist who works as a Senior Research Coordinator at Clewat.

Stjepan, from Croatia, became interested in micro-plastics already as a child, when he was living on an island off the coast of Croatia, where the beach was flooded with plastic.

Stjepan has previously worked as an entrepreneur and at the Finnish Environment Institute. He has strong experience in start-up companies.


Jukka joined the Clewat team on August 2020. He is working for sales in Finland.

Jukka is an experienced entrepreneur and known for many Finns for his career in ice hockey. He was part of Finland´s first ice hockey world champion team in 1995.

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