Overview & Engineering Methodology
Rooftop rainwater harvesting captures pure atmospheric precipitation from industrial sheds, commercial roofs, and residential buildings before it reaches contaminated surface drains. We deploy patented Rainy FL-series Dual-Intensity Filters that harness cohesive and centrifugal forces to continuously auto-flush dirt, silt, and leaves through an open-ended drain while directing over 90% of crystal-clear water into underground storage sumps or recharge borewells. No electrical power is required—the entire process is 100% gravity driven.
Salient Engineering Features
Dual Intensity Self-Cleaning Filter with automatic dirt expulsion
Operates purely on gravity head (> 1 foot) with zero power consumption
SS-304 Food-Grade multi-surface mesh (250 Microns) for hygienic water
UV-Treated High Density Polyethylene (HDPE) housing with 10+ year lifespan
Handles heavy storm downpours up to 75 mm/hour without overflowing
Multiple models: FL-80, FL-150, FL-250, FL-300, and FL-500
Technical & Material Specifications
| Filter Element | SS-304 Multi-Surface Screen (Food Grade) |
| Mesh Size | 250 Microns |
| Operating Principle | Cohesive Force & Centrifugal Force (Self-cleaning) |
| Housing Material | UV-Treated High Density Polyethylene (HDPE) |
| Operating Pressure | > 1 foot of Gravity Head (0.060 kg/cm²) |
| Filter Efficiency | Above 90% under standard operating conditions |
Typical Applications & Sectors
Industrial warehouses and factories with large shed roofs
Commercial malls, hospitals, and educational institutions
High-rise residential apartments and independent villas
Open well and borewell direct recharge configurations
Need Full Engineering Drawings & Brochure?
Download the official 8-page Allegiance technical catalog.
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Other Solutions
- Rain Water Management & Artificial Groundwater Recharge
- Rainwater Collection, Storage & Reuse Systems
- Flow Control Devices & IoT Telemetry Systems
- Ground Water Level Monitoring & DWLR (Digital Water Level Recorders)
- Water and Wastewater Treatment Plants (STP / ETP / RO / Softener)
- Ground Water Consultation & CGWA Regulatory Services
- Sustainable Development & Ecological Green Services