- This is the largest version of the Wisy Vortex filter, designed specifically for larger buildings. The 300mm diameter inlet pipe makes the filter suitable for roof areas up to 3000m2.
- The filter efficiency remains above 90% at flows up to 13 litres/second, and the unit can process a maximum flow rate of 80 l/s. The extremely robust construction means it has a gross vehicle weight rating of 60 tonnes, the only filter unit capable of taking heavy goods traffic without the need for a separate chamber.
- The Wisy Vortex WFF300 filter is supplied complete with a heavy gauge stainless steel base-plate to provide stability when installed below ground. This also enables the filter to be used above ground by having the baseplate span brick pillars or similar.
- *the 3000m² figure quoted is a nominal figure and should be used as a guide only. It has been calculated based on a rainfall intensity of 5mm per m² in 15 minutes. During such conditions, on a 200m² roof, the filter will function at a hydraulic efficiency of over 95%. This is equivalent to 16.6 litres per second. The actual capacity of a 300mm ID pipe is 80.6 litres/sec with the pipe 0.7 full (according to DIN EN 12056)
Wisy WFF 300 Vortex filter
WISY® WFF150 Vortex Filter
The WISY® WFF150 Vortex Filter is a robust, commercial-grade rainwater filter designed for roof areas up to 500m2 (nominal guide based on a rainfall intensity of 5mm per m2 over 15 minutes).
A staple in RainTech® rainwater harvesting systems, it features a 30-tonne vehicle-duty load capacity.
Performance & Specifications
Filtration Efficiency: Offers industry-leading 0.28mm fine filtration, achieving over 95% hydraulic efficiency 2.78 l/s under standard peak rainfall conditions.
Flow Capacity: Accommodates a maximum 150mm ID pipe capacity of 12.8 l/s at 0.7 full (per DIN EN 12056).
Water Quality: Features a unique design that naturally oxygenates incoming water.
Maintenance & Installation
As a completely self-contained unit separate from the tank, it eliminates the need to kneel, lie down, or access awkward underground tanks (even shallow 60cm burials). Maintenance is simplified via an included long lifting handle, making it the premier choice for professional installations.
WISY® WFF100 Vortex Filter
The WISY® WFF100 Vortex Filter is a premium, robust rainwater filter optimized for domestic applications and roof areas up to 200m2. Boasting a 30-tonne vehicle-duty load capacity, it serves as the core filter for RainSava® rainwater harvesting systems.
Key Benefits & Performance
Superior Water Quality: Delivers industry-leading 0.28mm fine filtration alongside a unique water oxygenation process.
Streamlined Maintenance: Designed as a self-contained unit installed completely separate from the storage tank. This layout eliminates the need to awkwardly reach, kneel, or lie down to access shallow underground tanks 60cm deep.
Ergonomic Servicing: Includes a long lifting handle that allows for fast, simple cleaning from ground level without tank entry.
Rainharvesting Systems Ltd are the sole suppliers of Wisy products in the UK.
Wisy are widely regarded as the gold standard in rainwater filtering.
The WISY VORTEX is a patented rainwater filter that uses a vertical cylinder and natural adhesion to separate clean water from debris down to 0.28mm.
Because leaves and organic matter are instantly washed past the vertical mesh and sent straight to the storm drain, the system is virtually self-cleaning and prevents blockages or organic breakdown inside the tank.
Additionally, the filtration process continuously oxygenates the water, inhibiting the anaerobic bacteria that cause bad odours.
Highly reliable and versatile, Wisy filters are trusted across Europe for everything from small domestic setups to stadium-scale commercial systems.