Schenkeveld, a large-scale tomato grower in the Netherlands, requires substantial volumes of irrigation water on a daily basis. Following the acquisition of a new production site, water quality at that location proved to be a longstanding concern.
The site included two rainwater storage silos with capacities of 6,500 m³ and 2,500 m³. "Algae had been able to develop freely, causing structural problems. This was visible not only in contaminated water, but also in clogged filters, additional maintenance, the use of chemicals and extra labour, as well as uncertainty further down the water chain."
Such issues are familiar to many greenhouse growers, according to Ultramins, the supplier of USAF™ cavitating ultrasonic transmitters. A practical trial was conducted during the summer period in the 6,500 m³ rainwater silo at Schenkeveld. The system was installed at a time when algal pressure and microbiological load are typically at their highest, in order to assess performance under demanding conditions.
"When Ultramins approached us for this trial, I said I would like to be able to see the bottom of the silo for once," says Richard Schenkeveld. "To be honest, that had never been possible in all those years."
Within approximately three weeks of installing the USAF™ transmitters, the situation changed significantly. The previously turbid, algae-rich water became clear enough to see the bottom of the silo (as can be seen in the photo on the left).
© Ultramins
Confirmation of measurements
Water analyses confirmed the visual improvement in quality. Algal pressure declined sharply, biofilm dissolved and pathogens were no longer detected in the water.
"Our water analyses were carried out weekly by Normec Groen Agro. For us, the absolute number of algae per millilitre is less important than the fact that algae no longer have a harmful impact on our installation, water system and crop."
According to the grower, the increased stability of the system is a key benefit. "By starting the process with clean and healthy rainwater, we prevent problems further down the chain. That translates into fewer blockages, fewer corrective measures, lower costs and, above all, greater operational peace of mind. Healthy irrigation water also plays a major role in preventing crop losses and contributes to resilient cultivation and stable production."
© Ultramins
Deployment to multiple locations
Based on the results of the trial, the Growers United cooperative, of which Schenkeveld is a member, has decided to invest in the application of USAF™ transmitters at several Schenkeveld locations from early 2026.
"The aim is not only to maintain the achieved water quality, but to structurally embed it as part of our water management strategy," says Richard Schenkeveld. "The combination of visible results, measurable improvements and the completely chemical-free nature of the technology makes Ultramins a valuable partner for us. Their solution shows that water quality does not have to be an uncertainty, but can form a controllable and reliable foundation for cultivation."
USAF™ is a trademark of Luijkx Ultrasound B.V.
For more information:
Ultramins B.V.
+31(0) 85 023 10 97
[email protected]
www.ultramins.com
Schenkeveld
[email protected]
www.schenkeveld.co
Growers United
[email protected]
www.growersunited.nl
