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Quick explanation

  1. Gravity transports greywater to the system.
  2. Preliminary filtration removes large debris (like hair).
  3. Greywater enters biological treatment tank for oxygenation.
  4. Oxygenation helps the growth of beneficial bacteria.
  5. Fine hollow fibers filter out bacteria and viruses.
  6. Treated greywater is stored in clean tank for distribution.

Detailed explanation

Pre Filtration 

Greywater is transported from collection points within bathrooms across the building via a separate network of pipes. Not only does this eliminate the potential for cross-contamination, it also allows the possibility of heat exchange technologies to recover heat from the waste greywater.

Preliminary filtration removes undissolved contaminants from the greywater supply including hair and textile fibres. On Stormsaver Systems, preliminary filtration is supplied with a high-pressure backwash feature which supplies processed greywater to provide self-cleaning to the preliminary filtration device. 

Biological Treatment

Greywater then enters the biological treatment tank.

The biological treatment process introduces aeration to naturally degrade organic contaminants such as shower gels and foam. The biological treatment tank also contains growth bodies to separate biofilm from the greywater. Growth bodies are designed to increase the surface area within the tank for biofilm to attach. 


Aeration assists suspended solids in settling on the base of the treatment tank via sedimentation. These are removed via an efficient sludge pump. 


Greywater is then processed through ultrafiltration. Ultrafiltration processes greywater through hollow fibres to separate any remaining microbiological particles such as bacteria and viruses (rated to 0.02 microns). The automatic self-cleaning process includes a short backwash of the ultrafiltration device to remove contaminants for the best possible water quality. The control panel fully automates this process for complete peace of mind. 


Treated greywater is then transferred a separate clean water tank for storage until required. A low nutrient load from the biological treatment process and removal of solid particles ensures greywater can be stored for extended periods. 

Mains water topup

Where limited greywater is available, an automatic mains water backup will continue to provide a water supply to outlets. The mains water backup is achieved through a WRAS-compliant air gap in the clean water tank. The process is fully automated by our control panel. 

Water Availability

Water is our most precious resource. 

Just like many natural resources, it is expected that we will face shortages in the future. In the UK alone, our water deficit is set to reach 5 billion litres per day, according to the Environment Agency. 

Greywater Recycling provides a solution to reduce reliance on public water supplies by collecting and recycling wastewater already on site. Greywater can meet up to 75% of the total water demand. 

Discharge Rates

UK drainage infrastructure frequently reaches capacity and overflows during heavy storms. Every time a sewer overflows, untreated sewage is released into local water courses. 

Greywater forms a large volume of wastewater runoff from a building. Reusing this greywater is an effective method of reducing the volume of runoff from the site. 


Greywater Recycling is a highly safe method of reusing greywater. A mixture of physical, biological, and chemical treatment ensures complete peace of mind over the safety of supply. 



Where recycled greywater can be used...

Greywater Recycling is an effective solution for improving water efficiency through the provision of a non-potable water supply. Non-potable water supplies can be used for the following applications...  

  • Toilet and urinal flushing
  • Vehicle washing
  • Cleaning and wash down
  • Laundry
  • Living wall watering and irrigation
  • Industrial and manufacturing use
  • Cooling and conditioning
Ideal building types 

Greywater Recycling is most suited to high-capacity buildings where a continuous supply of non-potable water is required to serve connected outlets. Greywater Recycling can also be used where there is limited roof space available for the collection and reuse of rainwater. Greywater Recycling can be used as an alternative to rainwater harvesting or the technologies can be combined to provide higher volumes. 

  • Leisure centres 
  • High-capacity venues 
  • Offices 
  • Hotels
  • Mixed-use developments

Our Commercial System Types 

Greywater Recycling should be sized specifically to the project requirements. This is dependent on several factors, including number of collection points and the total non-potable water demand.

We always recommend speaking to our team of specialists about your project requirements. Below is a summary of our different arrangement types.

Standalone Solutions

  • NSF certified to provide high levels of water quality.
  • High-efficiency ultrafiltration (0.05 microns) to remove bacteria and viruses.
  • Intelligent self-cleaning technologies to minimise maintenance requirements.
  • Automatic chemical dosing prevents biofilm from blocking associated pipework.
  • IoT Remote monitoring of system operations via desktop or mobile app.
  • Can be supplied in a range of capacities, tailored to your requirements.
  • Smart controls to allow for flexible shut-down periods.

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Combined Solutions

  • Greywater Recycling, Rainwater Harvesting, and Active Attenuation can be combined into one intelligent system.
  • Compatible with many attenuation types, including crates, tanks, and blue roofs.
  • Maximises available supply by reusing rainwater and greywater.
  • Supplied in above or below-ground arrangements.
  • Commonly used in densely populated areas where space is limited.
  • Ideal for meeting water neutrality requirements.
  • Not solely reliant on weather patterns.

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Technical Features

IOT Monitoring: Access real-time information system health, faults, and receive notifications on service and maintenance requirements.

High-Efficiency Ultrafiltration: Removal of microbiological contaminants down to 0.02 microns, providing a safe, clean water supply.

Self-Cleaning Cycles: Automatic backwashing of filters, prolonging lifespan and reducing maintenance requirements.

Variable Controls: Ease of start-up and shutdown of the system for building closure periods.

Autonomous Chemical Dosing: Removal of biofilm from associated pipework via smart chemical cleaning, preventing blockages and disruption.

High-Pressure Cleaning: Debris from pre-tank filters are removed via a high-pressure backwash nozzle, removing debris and increasing system efficiency.

Further Information

Commercial Greywater Recycling captures and recycles water from showers, handwash basins, and bathtubs for the creation of a non-potable water supply. 

Why Choose Stormsaver?

 An illustrative image showing a greywater recycling filter

Our Added Value Options

Looking for UV disinfection or installation services on your new greywater system? Our added value options give you access to best-practice approaches. Learn more here. 

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