1. Introduction
The OSWNKW-76 pre-filter is designed to combat secondary pollution in your water supply pipeline, making it suitable for household installation and use. It effectively filters out solid impurities such as rust, sediment, algae, and colloids from pipelines. This prevents water pollution, pipeline corrosion, and protects household appliances and fixtures like water purifiers, dishwashers, coffee machines, water heaters, washing machines, underfloor heating systems, heat sinks, and solar energy equipment. It acts as the first line of defense for clean water in your home.
Before using this product, please read this manual carefully and keep it for future reference.
2. Product Specifications
| Parameter | Value |
|---|---|
| Product Name | Clamp type pre filter |
| Product Model | oswnkw-76 |
| Product Material | 304 Stainless Steel (Cylinder Body), 316L SUS Stainless Steel (Filter Element) |
| Operating Water Temperature | 5-100 °C (41-212 °F) |
| Purified Water Flow Rate | 6000 L/H (6 inches), 10000 L/H (10 inches) |
| Filtering Accuracy | 40 μM |
| Flushing Mode | Manual Flushing |
| Installation Purpose | Household/Industrial Water Purification |
| Water Source Used | Municipal Water/Deep Well Water |
| Filter Size (10-inch model) | 45mm * 260mm (filter element) | 157mm (width) x 375mm (height) (overall) |
| Applicable Water Pressure | 0.1-0.4MPa (1-4 bar / 29-58 PSI) |
| Interface Diameter | DN20 (3/4") or DN25 (1") MNPT external thread |
| Certification | CE, RoHS |
3. Package Contents
The package includes the following items:
- 1 x OSWNKW Pre-Filter Unit
- 1 x User Manual
- 2 x MNPT Adapter (G1/2", G3/4", or G1" depending on selection)
- 1 x Drain Ball Valve
- 1 x Water Pressure Gauge
- 2 x Washers
4. Installation Guide
4.1 Pre-Installation Checks
- Before installation, ensure all components are present and in normal condition.
- Ensure the raw material tape is fully and evenly wound around the inlet and outlet threads.
- When tightening the filter bottle thread with a wrench, ensure it is tightened securely but not overtightened.
4.2 Installation Steps
The OSWNKW-76 pre-filter is designed for flexible installation and can be placed in various locations, including under cabinets, thanks to its compact size.
The filter should be installed at the main water inlet of your home to protect all downstream water-related appliances.
Important Considerations:
- It is recommended to install a pressure reducing valve before the pre-filter if your working water pressure is outside the 0.1-0.4MPa range to prevent damage from excessive pressure.
- The pre-filter comes with a plug cover for transportation; this must be removed before installation.
- After installation, carefully observe for any leakage or seepage in the connecting parts.
5. Operation
5.1 Water Pressure Monitoring
The built-in water pressure gauge allows for real-time monitoring of water pressure. The general household water pressure range is 0.1MPA-0.4MPA (29PSI-58PSI). If abnormal water pressure is observed, take appropriate measures to address it.
5.2 Flushing (Backwash)
Flushing the filter is quick and simple, requiring no tools. Simply rotate the drain ball valve 90 degrees downwards to perform flushing. Ensure the sewage outlet is connected to a sewage pipe or a container to collect the flushed water.
6. Maintenance
6.1 Filter Element Cleaning
The filter element should be cleaned every 15-30 days, or when the filter screen accumulates viscous impurities or particles that cannot be washed out normally by flushing, affecting outlet pressure.
To clean the filter element:
- Close the main water inlet valve to the pre-filter.
- Open the buckle to release the clamp and remove the filter housing.
- Twist the filter element directly to detach it from the head unit.
- Clean the 316L stainless steel mesh filter element thoroughly under running water.
- Reassemble the filter element by twisting it back into the head unit.
- Reattach the filter housing and secure the clamp.
- Open the main water inlet valve and check for leaks.
7. Troubleshooting
- Low Water Pressure / Reduced Flow:
- Check the water pressure gauge. If it indicates low pressure, the filter element may be clogged. Perform a backwash or clean the filter element as described in the Maintenance section.
- Ensure the main water inlet valve is fully open.
- Water Leakage / Seepage:
- Immediately turn off the main water supply.
- Check all connections for proper tightening. Ensure raw material tape is correctly applied to threads.
- Inspect O-rings and gaskets for damage or improper seating. Replace if necessary.
- Abnormal Water Pressure:
- Monitor the water pressure gauge. If pressure is consistently too high or too low, consider installing a pressure reducing valve before the pre-filter.
- If water pressure is unstable at night or when going out for a long time, it is advisable to close the main water inlet gate to the pre-filter tap water to prevent potential issues.
8. User Tips
- Protecting Your Home: The pre-filter is designed to protect your entire home's plumbing and appliances. Consider its placement carefully to maximize its protective benefits.
- Floor Drain Awareness: For safety, especially in areas like kitchens, bathrooms, and balconies where floor water may accumulate, be aware of the location of floor drains when performing maintenance or flushing.
- TDS Value: Note that this pre-filter does not change the Total Dissolved Solids (TDS) value of the water; it primarily removes sediment and suspended particles while retaining beneficial minerals.
- Temperature Resistance: The filter is designed to withstand a wide range of temperatures (5-100 °C), making it suitable for various climates.
9. Warranty and Support
For specific warranty information, technical support, or service inquiries, please contact the seller or manufacturer directly. Keep your purchase records and this manual handy for any claims.
The product is designed for durability, with a 304 stainless steel cylinder body (1.2mm thick) that has passed 100,000 water hammer tests and a maximum pressure test of 1000 pounds per square inch, ensuring safety and longevity.
