1. Introduction
The OSWNKW-05 Whole House Pre-Filter is designed to provide initial filtration for your entire home's water supply. It effectively prevents particles such as sand, rust, limestone, and other sediments from entering your household plumbing system. By installing this pre-filter, you can extend the lifespan of your pipes, faucets, shower heads, water heaters, washing machines, RO water purifiers, and other water-related appliances.
This manual provides detailed instructions for the safe and efficient installation, operation, and maintenance of your OSWNKW-05 pre-filter.
2. Safety Information
- Always turn off the main water supply before attempting any installation or maintenance.
- Ensure all connections are secure and leak-free to prevent water damage.
- Do not use the filter with water temperatures exceeding 40°C (104°F) or below 0°C (32°F).
- Do not expose the filter to direct sunlight for prolonged periods.
- If you are unsure about any installation steps, consult a qualified plumber.
- Keep out of reach of children.
3. Package Contents
Please check the package to ensure all items are present:
- 1 x OSWNKW-05 Pre-Filter Unit (with or without water pressure gauge, depending on configuration)
- 1 x User Manual
- 1 x Special Wrench
- 2 x G3/4" MNPT adapter or G1/2" MNPT adapter (depending on selected size)
4. Specifications
| Attribute | Value |
|---|---|
| Brand Name | OSWNKW |
| Model Number | 05 |
| Interface Diameter | DN20 (also available in DN15) |
| Water Quality Requirements | Municipal Water/Well Water |
| 5 Stage Filtration | No (Pre-filter only) |
| Water Yield (Liter/Minute) | 3.0 (equivalent to 3000L/H) |
| Installation | Undermounted/Wall Mounting Type |
| Function | Indirect Drink (Pre-filtration) |
| Material | Stainless steel (filter mesh), Lead-free brass (main body head), Food grade explosion-proof PC cover (shell) |
| Purifying Position | Central Purification |
| Certification | RoHS |
| Type | Stainless Steel Mesh |
| Water treatment machine Type | Pre-Filter |
| Use | Household Pre-Filtration |
| Filter Accuracy | 40 μM |
| Working Pressure | 0.1-1.0MPA (1bar-10bar) |
| Applicable Water Temperature | 0-40 °C |
| Dimensions (approx.) | DN15: 8.7cm (W) x 21.3cm (H); DN20: 5.3cm (W) x 26.5cm (H) |
5. Installation (Setup)
The OSWNKW-05 pre-filter is designed for flexible installation and comes with 1/2" and 3/4" external threaded MNPT adapters. You may need to purchase additional adapters depending on your existing plumbing (e.g., for copper, PEX, or CVC water pipes).
Installation Steps:
- Turn off Main Water Supply: Locate your home's main water shut-off valve and turn it off completely.
- Drain Water Lines: Open a faucet at the lowest point in your home to drain residual water from the pipes.
- Choose Installation Location: Install the pre-filter after the main water meter and before any other water treatment systems or major appliances. Ensure there is enough space for maintenance.
- Prepare Pipes: Cut into the main water line at the chosen installation point. Ensure the cut ends are clean and free of burrs.
- Connect Adapters: Apply thread sealant tape (not included) to the threads of the provided MNPT adapters and connect them to your existing plumbing.
- Install Pre-Filter: Connect the pre-filter unit to the adapters, ensuring the water flow direction matches the arrow on the filter head. Tighten connections using the special wrench provided, but do not overtighten.
- Check for Leaks: Slowly turn on the main water supply and check all connections for leaks. Tighten any leaking connections as necessary.
- Flush the System: Open a nearby faucet and let water run for a few minutes to flush out any air or loose particles from the system.
6. Operation
Once installed, the OSWNKW-05 pre-filter operates continuously to filter your incoming water supply. The transparent housing allows for easy visual inspection of the filter element's condition.
Monitoring Water Pressure:
The unit is equipped with a built-in water pressure gauge, allowing you to monitor your home's water pressure in real-time. The general household water pressure range is typically 0.1MPA-1MPA. Significant deviations from this range may indicate an issue with your water supply or plumbing system.
7. Maintenance
Regular maintenance ensures the optimal performance and longevity of your pre-filter.
Backwashing (Cleaning the Filter Element):
The OSWNKW-05 features a manual rotating scraper for easy backwashing. When the filter element appears saturated with sediment (visible through the transparent housing), it's time to clean it. This process does not require disassembling the entire unit.
- Open Sewage Ball Valve: Turn the sewage ball valve at the bottom of the filter to the right (usually a quarter turn) to open it. This will release the accumulated sediment.
- Rotate Scraper: Manually rotate the scraper mechanism (the blue dial at the bottom) to dislodge sediment from the stainless steel mesh. Continue rotating until the water running from the sewage valve appears clear.
- Close Sewage Ball Valve: Turn the sewage ball valve back to its original position to close it.
It is recommended to clean the filter element every 15-30 days, depending on your water quality and usage.
Filter Element Replacement:
While the stainless steel mesh filter is designed for long-term use and backwashing, it may eventually need replacement. It is recommended to replace the filter element every 1-3 years, depending on your water quality and how frequently it is cleaned.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Low Water Pressure | Clogged filter element | Perform backwashing to clean the filter. If pressure remains low, consider replacing the filter element. |
| Water Leaks | Loose connections, damaged O-rings, cracked housing | Check and tighten all connections. Inspect O-rings for damage and replace if necessary. If housing is cracked, the unit may need replacement. |
| Visible Sediment After Filtration | Filter element damaged or improperly installed | Inspect the filter element for tears or damage. Ensure it is correctly seated within the housing. Replace if damaged. |
| Pressure Gauge Malfunction | Gauge is faulty or clogged | If the gauge is not responding, it may need to be replaced. Ensure no debris is blocking the gauge's connection. |
9. User Tips
- Understanding the Rotary Scraper: The rotary part (blue dial) at the bottom of the filter is the manual scraper used for backwashing. Turning it helps dislodge accumulated sediment from the filter mesh, allowing it to be flushed out through the sewage valve. This is a key feature for easy self-cleaning.
- Regular Visual Checks: Make it a habit to visually inspect the transparent filter housing every few days. This allows you to quickly assess the sediment buildup and determine when backwashing is needed, preventing significant pressure drops.
- Record Cleaning Dates: Use the recordable cleaning month dial on the filter to mark when you last performed maintenance. This helps you stay on schedule for optimal filter performance.
10. Warranty and Support
For warranty information and technical support, please refer to the contact details provided by your retailer or the manufacturer's official website. Keep your purchase receipt as proof of purchase for any warranty claims.