Practical products and tools for water marketers that actually work.
Wastewater Calendar 2027 (coming soon)
Coming soon. The calendar will be available to order here shortly.
Shipping starts on 2 November 2026.
Clean water is not a luxury. It's life.
The 2027 Wastewater Calendar is a desk calendar that celebrates the places where water is brought back to life, with thirteen photographs from the world of wastewater treatment.
As every year, all proceeds will be donated. This time to Viva con Agua, an international network working on water, sanitation and hygiene projects in Africa and Asia.
A calendar that not only looks good, but does good.
Together, we make water visible and help where it's needed most.
Practical products for Water Technology Companies
Practical marketing courses for Water Technology Companies
Learn proven marketing strategies, industry-specific frameworks and practical implementation techniques designed specifically for the watertech industry.
Our team combines engineering knowledge with B2B marketing. Most of us have an engineering background or long experience in the water sector, alongside specialists in strategy, social media, video and marketing automation.
Interius was founded by Björn Otto, who has worked in water treatment for more than 15 years. Since then, we have worked with companies across many areas of water technology, including membranes, online analytics, PFAS treatment and digital network monitoring.
So you don’t have to explain your technology to us. We discuss processes with your engineers and markets with your management, with equal fluency.
Water technology only. We work exclusively for water and wastewater technology companies. We already know the processes, the buying cycles and the people who decide. You don’t pay for our learning curve.
We address the real problem. Many water technology companies have proven their technology but never explained it. We call this the Technology Trap: heavy investment in pilots, certifications and performance data, too little in positioning, communication and trust. That gap is where we work.
Every claim holds up to scrutiny. Your buyers are engineers, operators and investors who check every number. So every performance claim we write comes with its source and test conditions, or it doesn’t go in. We write copy a process engineer would forward to a colleague without hesitation.
One partner, several ways in. Strategy and execution, team training, ready-to-use templates, industry formats and market data. You start where your need is.
Every year, we publish a printed calendar featuring wastewater treatment plants in Germany and Switzerland, photographed by people who work in the sector. It shows infrastructure everyone relies on and hardly anyone sees.
All sales proceeds go to organisations working for clean water, sanitation and clean waterways. Supported so far: Viva con Agua, Tandia, WeWater and Sungai Watch.
FAQs
Here you’ll find answers to common questions about our products, the purchasing process, and access after checkout.
What happens after purchase?
After completing your purchase, you’ll receive all relevant information via email.
How do I access my purchased product later?
You can access your purchase anytime using the information and access details sent to you via email after completing your order.
Do I receive an invoice?
Yes. An invoice will be generated automatically and sent to you after your purchase.
What payment methods are available?
We offer secure payment via trusted payment providers. Available methods may vary depending on your location.
Who are these products for?
Our products are created for marketing professionals and teams working in the water technology industry.