Join us as

Let us know if you have a grease trap installed or not. This information is crucial in the fight to protect Amsterdam’s sewers.

Join your fellow restaurateurs and help us keep Amsterdam clean.
Become Vetstrijder.

Step 1

Let us know which establishment you run

Step 2

and whether you have a grease trap or not

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Step 3

Complete your registration and submit the form

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Step 4

Get access to the Waternet online portal

* A grease interceptor is a device which separates wastewater from fats, oils, and grease before entering the sewer system. Most establishments have one installed in the kitchen, basement or outside the establishment underground.

These food serving businesses are already


Tips for sustainable entrepreneurship

CSR – Corporate Social Responsibility (CSR) – is not just a buzzword. It is a self-regulating business model that helps a company be socially accountable—to itself, its stakeholders, and the public. By practicing corporate social responsibility, also called corporate citizenship, companies can be conscious of the kind of impact they are having on all aspects of society, including economic, social, and environmental.

But what does it really mean for a food business?  The starting principles are here:

  • Creating a balanced value in economic (Profit), ecological (Planet) and social (People) fields.
  • CSR is embedded in all business processes. With every business decision, the different stakeholder interests are weighed up: the interests of the persons, companies and organisations involved. CSR is tailor-made. The CSR activities are different for every company. It depends on company size, sector, culture and company strategy.
  • CSR is a process, not a final destination. Objectives change over time with every business decision. The company looks to shape its social responsibility.

Vetstrijder is supported by

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What is Vetstrijder?
Vetstrijder - which literally means Fat Fighter - is a project to raise awareness about this growing issue. In part through extensive field work on the streets of Amsterdam, and by also providing an online platform for better grease management, offered by Waternet.

As a Vetstrijder you're implementing best practices to prevent fats, oils and grease from entering the sewer lines.

Continue reading and learn how your establishment can make a difference.
This is the problem
Amsterdam is increasingly at risk due to the sheer volume of fats, oils and grease (FOG) that is entering the sewer system. Blockages are affecting daily life within the city center and the surrounding environment.

To provide a long-term solution to the growing threat of fatbergs, we must significantly reduce the amount of fat, oil, and grease that escapes down the sink.
Why you should care
"The costs for maintaining the sewer network continue to increase every year. The more we need to show up for interventions, the more nuisance for the Amsterdamer. Preventing FOG from entering the sewers means you’re tackling the problem at source. That’s why we endorse Vetstrijder."

Jeroen de Boer
The cost
In 2016, the maintenance costs of the sewerage system in 2016 amounted to no less than 42.6 million euros.

The annual costs for the management of the sewerage system are estimated to increase by 1.2 million euros to € 43.8 million euros by 2021.
What is a grease interceptor?
A grease interceptor is a container between the drain and the public sewer where the wastewater flow is being slowed down. It allows solid particles to sink, and FOG to rise to the surface. The remaining water flows through to the sewer system.

In the case of an inspection by the enforcement department, inspectors pay attention to the maintenance cycle in particular as wastewater samples can’t be taken during inspection because fat concentration can fluctuate considerably.
The two most important aspects for a properly working grease interceptor: a suitable size and frequent maintenance. The standard rule says the grease interceptor must be inspected, emptied and cleaned at least once a month.

Maintaining or emptying your grease interceptor on time will ensure that you avoid unnecessary costs due to sewer disruptions and blockages.
What happens to collected FOG?
The removal of the (solidified) fat from the grease interceptor must be carried out by a recognized service provider. When cleaning the interceptor, a mix of fat, water and sludge is pumped out and removed.

Service providers sustainably treat the fat and convert it into various useful products including environmentally friendly biodiesel.
Brown vs. white grease
Fat in wastewater mainly comes from pan fat, or cooking fat. We try to recover this so-called brown fat with the fat separator as a raw material for biodiesel. Yellow or white fat from the frying machine is collected in a barrel. It is relatively pure and requires fewer processes to be used as a raw material for biodiesel. Nowadays, fat collectors pay for used frying fat. Sometimes it is possible to have the same service provider carry out the inspection and fat removal at the same time.
Our story
The Vetstrijder project is a collaboration between Waternet and SwiftComply.

The objective of this project is to raise awareness and address the threats of fats, oils and grease. The output is to gain behavior insights and measure the grease trap adoption rate in the Amsterdam food serving sector.

Over 3,000 food service establishments have already become Vetstrijder.

ABOUT Waternet
Waternet is the only water company in the Netherlands that covers the entire water cycle. This includes water for natural areas and human consumption, and wastewater treatment.

Their mission is to get the most out of water. They work towards solutions that are beneficial for both people and society in cooperation with residents and entrepreneurs to ensure a safe, clean and sufficient water supply. In addition to that, Waternet is constantly looking for new ways to work towards a green future. And that’s what it does with the SwiftComply platform: to reduce the amount of FOG in their sewer system.
Go to Waternet >
ABOUT SwiftComply
SwiftComply is a software platform that connects water utilities, cities, food businesses and waste haulers to streamline compliance.

The main objective is to reduce the burden of regulation on small to medium hospitality businesses, and to reduce the impact of fats, oils and grease (FOG) on the environment.

SwiftComply currently works with over 400 cities and utilities in the US, Canada and the UK.
Go to SwiftComply >
Knowledge is key
To tackle the problem, we need to understand the nature of the problem. That’s the reason why we need to map the FOG management practices from food service businesses.

Initially, above-ground data on the number of restaurants, cuisine type, and contact details are collected using specially designed cloud-based software: SwiftComply. The information can then be expanded by finding out more about onsite FOG management from site visits, telephone interviews, and digital questionnaires.
A shared responsibility
Waternet does its part to clean up the sewers, but the catering industry bears responsibility too for the correct discharge of wastewater.

By registering on, catering establishments create an account on the Waternet portal at SwiftComply.

Even those who do not have a grease interceptor are asked to sign up for this, as we want to learn what the adoption rate is of grease removal devices throughout the hospitality sector.
Already more than 3000 registrations
Since the call from Waternet in April 2019, more than 3,000 catering businesses have registered as a Vetstrijder. That is about three in four restaurants of Amsterdam.
Register yours now >
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The Vetstrijder field project captured some of the local media's attention. The Metro, one of the most popular newspapers amongst commuters, followed us for a day in the field.
Read more >
The grease trap, or grease interceptor, is a central theme in this second edition of the Vetstrijder Gazette. It also features inteviews with an Amsterdam food entrepreneur, Waternet, suppliers and experts from the industry.
View here
The very first Vetstrijder Gazette was distributed during our field work during the summer of 2018. This FOG-dedicated newspaper sheds a light on the purpose of the Vetstrijder project, and why food businesses play a key role in the fight agains fatbergs.
View here
Here’s everything you need to know as a food business entrepreneur, including facts and figures, as well as tips on best practices. Print this document, and give it a visible spot near your kitchen!
View here
This illustration is a very clear visualization of the entire Fats, Oils and Grease cycle, and the position that food businesses have within it.
View here
food serving businesses in Amsterdam have become Vetstrijder


Get inspired by the stories of catering entrepreneurs from Amsterdam persuing by sustainable entrepreneurship and kitchen management. Want to share your story with other Fat Fighters as well? Drop us a message:

Korte Ouderkerkerdijk 7

1096 AC Amsterdam

0900 9394

The Vetstrijder-project is a collaboration between SwiftComply and Waternet

©SwiftComply 2020

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