Greywater recycling plant GWI 1.1-500 (capacity 500 l/day)

This system can treat up to 500 liters of graywater per day.

The GWI 1.1 – 500 graywater recycling system is the compact indoor solution in the GWI series for treating graywater from showers, bathtubs, and sinks. It is particularly suitable for single-family homes with low water consumption, small residential units, and commercial applications with low graywater output.

Through a combination of biological treatment and modern ultrafiltration (membrane filters), graywater is reliably purified and made usable as service water. It is specifically used where drinking water quality is not required—e.g., for toilet flushing, cleaning purposes, or garden irrigation. When operated properly, the treated water meets the quality standards of the EU Bathing Water Directive for service water applications.

The system enables efficient savings of drinking water and supports sustainable water management in smaller residential and commercial units.

The delivery time for the system is approximately 4–6 weeks.

Functionality & Technology

The overall purification process consists of biological treatment followed by ultrafiltration. The treated water is then stored in the service or clear water tank.

The BioMembrane filter technology used ensures reliable separation of the biomass from the graywater through its barrier effect and guarantees a high hygienic quality of the service water.

The system consists of several coordinated components:

• Filtration tank with membrane filter for treating the graywater
• Service water tank for storing the treated process water
• Control cabinet with integrated control system and aeration pump

Greywater treatment is fully automated via an integrated control system. If there is insufficient service water available, standard-compliant drinking water is added to ensure a reliable supply at all times. After power outages, the system automatically resumes operation.

Applications

The GWI 1.1 – 500 graywater treatment system is designed for:

• Single-family homes
• Small residential units or outbuildings
• Office and commercial units with low water consumption
• Guesthouses or vacation rentals

It is ideal for any location where limited volumes of graywater need to be treated efficiently and in a space-saving manner.

Installation

• Indoor system, for installation in utility or service rooms.
• Installation, commissioning, and maintenance must be performed exclusively by qualified personnel.
• Separate piping required for greywater and process water.
• Pipes must be clearly marked in accordance with applicable standards.
• The treated water must not be connected to the drinking water supply.

The system must be installed and operated in accordance with applicable technical regulations (including DIN standards and the Drinking Water Ordinance). Service water systems must generally be reported to the responsible public health department.

Maintenance & Operation

• Annual maintenance by qualified personnel is required.
• Regular visual and functional inspections by the operator are recommended.
• Maintenance and inspections must be documented in the operating log.

Proper operation ensures a long service life, high operational reliability, and consistently high water quality. By adhering to the manufacturer’s specifications and handling the system responsibly, the system also requires minimal maintenance.

Advantages at a glance

• Compact greywater recycling system for small-scale applications
• Durable components enable reliable treatment of hygienically high-quality service water for many years when operated properly.
• Modern ultrafiltration for high-quality process water
• Fully automatic, reliable operation
• Reduction in drinking water consumption and operating costs
• Supply reliability through automatic replenishment

Additional features & notes

• The system is designed for the treatment of domestic graywater (e.g., shower, bathtub, hand basin).
• Kitchen wastewater, wastewater containing feces, or heavily contaminated wastewater must not be fed into the system (see instructions).
• The treated water is to be used exclusively as service water (not drinking water).
• During extended absences, the system should remain switched on to maintain biological function.
• Proper planning of the greywater lines is a prerequisite for trouble-free operation.
• Modifications to the system or control unit may only be performed by authorized technical personnel.