The WISY WFF 100 is engineered for small to mid-size roofs up to 2,100 sq ft, with the option to combine multiple units for more coverage. For larger projects, the WFF 150 handles up to 5,500 sq ft. Inside the filter, a spinning vortex pushes water through 280 micron stainless steel mesh (440 micron available), sending clean water to storage and debris to the drain. Typically installed in-line with your piping, it captures up to 95% of clean rainwater while flushing debris to the drain.
The WFF 100 is built to last, simple to maintain, and flexible to install. See Specifications for roof compatibility and installation details. Perfect for homes, small businesses, and agricultural buildings. Use the water for gardens, lawn care, toilet flushing, laundry, car washing, and hosing off the deck. Post-tank filtration and purification systems make rainwater safe for whole-home use and livestock. For questions about additional treatment options, including potable use, contact a member of our team.
Have questions about design, application, or installation? Our team knows these systems inside and out. Give us a call today.
Key Specs: 66 GPM max flow | 280 micron filter (440 optional) | 2,100 sq ft roof area per unit | Combine for larger roofs | Extension tube included (adds 22″)
Built for Efficient Collection
Filters over 1 gallon of stormwater per second
Covers up to 2,100 sq ft roof area per unit
Full pipe cross-section maintained with no internal bottlenecks
Multiple units can be combined for larger roofs
Self-Cleaning Vortex Technology
Spinning water action sweeps debris off filter mesh automatically
Leaves, moss, and sediment routed to stormwater system
Oxygen mixed into filtered water for improved storage quality
Built-in first flush diverts dirtiest initial runoff while filter saturates (up to 2 minutes)
Meets ARCSA/ASPE/ANSI Standard 63 for Rainwater Catchment Systems
Durable Construction
Stainless steel filter insert resists corrosion and debris adhesion
Polypropylene housing withstands soil, moisture, and ground chemicals
Vehicle rated to 30 metric tons over compacted subsoil or concrete slab
Stainless steel filter insert and lifting handle included
Low Maintenance
Inspection recommended only twice per year
Filter insert is dishwasher-safe
Can be pressure washed at 20″ nozzle distance
Smooth mesh surface reduces buildup
Flexible Installation
All three pipe connections rotate 360° independently
Below-grade or indoor mounting options
Optional wall brackets for indoor/shaft installation ((WH 0303) flat wall / (WH 0400) curved tank wall)
Extension tube included; trims to height using built-in saw grooves
Up to two extension tubes for deeper installations
End ring allows flush finish with surrounding pavement
Asphalt shingles: suitable for non-potable (flushing, laundry); generally not recommended for potable, testing untreated runoff is essential if pursuing
Green roofs: not recommended (retention and discoloration concerns)
Bitumen roofs: not recommended (possible discoloration from tar and carbon leaching)
Asbestos-cement roofs: not compatible (must be renovated before connection)
Let RMS help you determine how a commercial or residential rainwater collection system can help you save money and protect our most valuable natural resource. Our team is ready to answer any questions you have and help you find the right solution.
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