I. Product Positioning: The All-Round Guardian for Rainwater Pre-Treatment
In urban stormwater management and sponge city construction, source control and precision filtration are crucial prerequisites for ensuring long-term system stability and safe rainwater reuse. The High-Efficiency SAF Unit is the integrated pre-treatment solution born for this purpose.
Designed specifically for the initial core stage of rainwater management systems, it integrates three major functions—interception, first-flush diversion, and deep composite filtration—into one unit. It effectively intercepts suspended solids and intelligently separates the initially highly polluted rainwater, ensuring the quality of collected water is significantly improved from the source.
Core Highlights:
- Multi-Functional Integration: One unit replaces multiple traditional, separate components, saving space and cost.
- Flexible Configuration: Supports SAF (three-stage联动), SA (interception + diversion), SF (interception + filtration), or single-stage use. Can be precisely matched to project water quality and reuse requirements.
- Intelligent Operation: Features a built-in智能 first-flush diversion mechanism. Requires no external power, automatically separates polluted rainwater and cleans the filter.
- Robust & Durable: Main body constructed from PP (corrosion-resistant) and SS304 stainless steel, suitable for buried and other complex environments with a long service life.
II. Working Principle: Intelligent, Efficient, Maintenance-Free
The SAF Unit operates like an intelligent “rainwater goalkeeper.” Its automated workflow ensures high efficiency and peace of mind:
- Intelligent First-Flush Diversion: At the beginning of rainfall, as water passes through the unit, the built-in Intelligent Diversion Valve automatically discharges the initial rainwater—containing higher concentrations of SS, COD, oils, and other pollutants—through the drain outlet based on preset flow or time, preventing it from entering the storage tank.
- Precision Filtration of Mid-Rainfall: After the diversion phase ends, the drain outlet closes automatically. The cleaner rainwater passes through the built-in multi-layer stainless steel filter mesh/composite filter discs, where suspended solids and fine particles are effectively captured. The cleaned water proceeds to the subsequent system.
- Automatic Cleaning & Reset: After rainfall ceases, the drain outlet opens automatically. The captured pollutants are flushed out by the remaining water flow. The unit completes internal self-cleaning and resets to its initial state, ready for the next rainfall event.
III. Installation & Application: Simple, Flexible, Widely Applicable
Easy Installation:
The unit is a prefabricated, integrated product, including the main body well base, stackable extension shafts, and a manhole cover. For on-site installation, simply stack the shafts to the required burial depth, connect the inlet, outlet, and drain pipes, then backfill. This significantly reduces the construction timeline.
Broad Application Scenarios:
- Pre-treatment for rainwater harvesting systems in residential complexes and commercial plazas.
- Downstream filtration for Sponge City road/plaza LID (Low Impact Development) facilities.
- Initial rainwater pollution control in industrial parks.
- Any application requiring rainwater pre-treatment to ensure downstream water quality or equipment safety.
IV. Product Model Quick-Reference Chart
| Product Model | Inlet | Outlet | Drain Outlet | Main Body Material |
|---|---|---|---|---|
| LD-SAF-1 | DN100 | DN100 | DN50 | SS304 / PP + SS304 |
| LD-SAF-2 | DN200 | DN200 | DN65 | SS304 / PP + SS304 |
| LD-SAF-3 | DN300 | DN300 | DN65 | SS304 / PP + SS304 |
| LD-SAF-4 | DN400 | DN400 | DN65 | SS304 / PP + SS304 |
V. Why Choose Our SAF Unit?
Choosing the High-Efficiency SAF Unit means opting for a smarter, more economical, and more reliable starting point for your rainwater management:
- Extends System Lifespan: Effectively protects downstream pumps, filters, and rainwater modules, reducing maintenance costs.
- Guarantees Reuse Water Quality: Provides a higher-quality water source for reuse applications like irrigation and landscape replenishment.
- Reduces Operational Burden: Fully automatic operation, requires no electricity or manual intervention, and is virtually maintenance-free.
- Saves Overall Costs: Integrated design reduces overall investment in civil works, piping, and equipment procurement.
