The Mertens Home

Efficient water management in a water-scarce landscape.

David Mertens, who lives in a single-person household but hosts his children every other weekend, has created a home designed for maximum water efficiency and sustainability. By combining multiple water-saving technologies, he demonstrates how smart design can dramatically reduce household water use.

The solution.

David installed a Hydraloop H300, which treats greywater from showers and baths for reuse in toilets, laundry, and garden irrigation. Rainwater is collected and purified for showering, while drinking tap water is reserved for kitchen use, handwashing, and brushing teeth, averaging just 13 liters per person per day.

The result.

This integrated system significantly reduces water consumption and prepares the household for rising water costs. David explains:

“Water becomes scarcer and therefore more expensive. I wanted my home to be future-proof and ready for the increasing cost of water.”

With just a single Hydraloop H300, David’s home demonstrates that even small households can achieve substantial water savings, sustainability, and resilience for the future.

Project information

• Grimbergen, Belgium
• Single person household, with two children every other weekend

Installation details

• Devices: 1 x H300 unit
• Potential annual savings: 131.400 liters | 34,712 US gallons
• Treatment capacity: 360 liters | 95 US gallons per day

Usage details

• Collection sources: Showers and baths
• End uses: Toilet flushing, washing machines and garden irrigation

Water becomes scarcer and therefore more expensive. I wanted my home to be future proof to be ready for the increasing cost of water.

– David Mertens