CWN technology in practice

Clear Water Now applies nano cavitation technology across a wide range of water systems. From freshwater management and horticulture to aquaculture and recirculating installations.

Every practice case has its own conditions, such as system volume, flow rate, organic load, existing filtration, water quality and the purpose of the treatment. That is why we look beyond the technology itself and assess how it performs within the complete water system.

Case study: Province of Zeeland

Freshwater management in a creek ridge infiltration system

A practical trial for sustainable freshwater management is being carried out in Noordgouwe. Commissioned by the Province of Zeeland, a system is being developed to harvest freshwater during wet periods through level controlled drainage and later infiltrate this water into a sandy creek ridge.

The challenge is familiar in areas where freshwater availability is under pressure. Water not only needs to be moved, but also kept manageable within a technical system of pumps, pipes, filters, measuring points and changing water conditions.

The Scheldestromen Water Authority is involved in the permitting process for infiltration and abstraction. This means that the case study is not only about the technical implementation, but also about the broader question of how freshwater can be managed sustainably within existing water structures.

Within this case study, the latest version of the CWN solution is being tested, connected to CWN Control. Through this online portal, the operation of the Pulse unit can be monitored and the resonators can be controlled remotely. Sensors for monitoring water quality will be available soon.

The aim of the practical trial is to investigate whether CWN can contribute to controlling biofilm formation in the system and to the physical pre treatment of residues from crop protection products. The expectation is that, through this treatment, these residues can be made more available for binding to the carbon filter.

To assess this, measurements are carried out at multiple points in the system. Water quality is measured before the carbon filter, after the carbon filter and in the silo. This provides insight into the effect of the treatment within the complete installation.

The installation will be delivered in week 26 of 2026. The first phase focuses on installation, commissioning and practical experience. Measurements will be carried out in the coming months. Results and conclusions will be added later once they are available.

Contact us for a technical assessment.

Status: In delivery

Client: Provincie Zeeland

Water authority involved: Waterschap Scheldestromen and Waterwortel B.V

Location: Noordgouwe, Zeeland

Application: freshwater management and infiltration

CWN solution: CWN Pulse with resonators and CWN Control

Hydroponic lettuce and recirculation

Water quality in a fully recirculating cultivation system

At a practical location for hydroponic lettuce, a fully recirculating water system was in use. The water was reused within a combination of crop cultivation and aquaculture, which meant that algae formation, fungal pressure and microbiological load required continuous attention.

The challenge is familiar to growers working with recirculation. The system must remain stable while water is reused as much as possible and is not unnecessarily burdened with chemicals. Especially in hydroponic cultivation, small disturbances can quickly affect root health, growth and operational reliability.

Within this case study, an H2O Free resonator was used, the predecessor of the current CWN Free. In practice, reduced algae formation and lower fungal pressure were observed. A visible reduction of unwanted organisms in the water was also reported, including fly larvae and maggots.

Improved root development was also observed. The lettuce showed stronger development of fine root hairs, continued growing more rapidly and showed less root discoloration. During the test period, water analyses were carried out. No E. coli or Salmonella were detected in the tested recirculating water.

This case shows that nano cavitation can be an interesting option for cultivation systems in which water is continuously reused and microbiological pressure needs to remain manageable. At the same time, a well designed biofilter remains necessary for the biological balance of the system, including the breakdown of nitrite and ammonia.

Contact us, we will be happy to help.

Status: Practical experience completed

Key consideration: algae formation, fungal pressure and microbiological load

System type: fully recirculating water system

Location: Almere

Application: hydroponic lettuce and recirculation

CWN solution: H2O Free resonator, predecessor of the CWN Free

De Palingfabriek

Water quality in a recirculating aquaculture system

At De Palingfabriek in Rohel, a recirculating aquaculture system is used for eel farming.

In this type of system, water is continuously reused, which means that water quality, microbiological pressure, deposits and system stability have a direct impact on operational reliability.

The challenge is familiar to aquaculture companies that want to become more sustainable while maintaining control over water quality. Especially at high stocking densities and with limited water exchange, the system must remain stable. Deposits, cloudy water, microbiological load and differences between basins can affect growth, health and maintenance.

Within this case study, a CWN Free is placed in a basin without fish, but connected to the same water system. The pilot focuses on whether ultrasonic treatment in source water can contribute to reduced deposits, a lower microbiological load and a more stable water system.

During the test period, no notable signs of disease were reported.

The initial assessment focuses on installation, system behaviour and measurable water values. This includes temperature, oxygen, pH, conductivity, ORP, feed quantity, fish mortality, filter load, ammonium, nitrite and turbidity.

Would you like to know whether CWN is also suitable for your aquaculture system?

Contact us for a technical assessment.

Status: Pilot in progress

System type: recirculating aquaculture system

Assessment: installation, system behaviour and measurable water values

Location: Rohel

Application: eel farming and recirculating aquaculture system

CWN solution: CWN Pulse with CWN free

Practical experience in different water systems

CWN is applied and tested in a wide range of water systems, from horticulture and aquaculture to process water and water management. Conditions differ per location, but the question is often the same: how can water quality remain more manageable within an existing system?

Our installations and practical experience range from the Netherlands to international locations, including projects from Zambia to Norway. Do you have a specific challenge with biofilm, microbiological pressure, recirculation or water quality? Contact us. We will be happy to help assess the most suitable technical approach.

Discuss your water system

Would you like to know whether CWN technology is suitable for your application? Based on system volume, flow rate, water load, existing filtration and the desired objective, we assess which configuration is the most logical.

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