1. Introduction
This manual provides essential instructions for the safe and efficient operation, installation, and maintenance of your WilTec Sand Filter and Particle Filter, Model 51792. This filter is designed to ensure crystal clear water by effectively capturing impurities and fine particles in your pool. It is suitable for small and above-ground pools, offering reliable filtration with its robust design and multi-function valve.
Figure 1: WilTec Sand Filter and Particle Filter
2. Safety Instructions
Please read and understand all safety warnings and instructions before installing or operating this product. Failure to follow these instructions may result in property damage, serious injury, or death.
- Always disconnect power to the pump before performing any service or maintenance on the filter system.
- Ensure the filter is placed on a level, solid surface capable of supporting its weight when filled with sand and water.
- Do not operate the filter system if any part is damaged or missing.
- Keep children and pets away from the filter system during operation.
- Do not exceed the maximum operating pressure or temperature specified for the filter.
- Use only appropriate filter media (sand with a grain size of 0.4 to 0.8 mm).
- Ensure all connections are secure and leak-free to prevent water damage.
3. Product Overview
3.1 Key Features
- Efficient Filtration: Captures impurities and fine particles for crystal clear water.
- 5-Position Multi-Port Valve: Simplifies operation and maintenance with distinct settings for Filter, Rinse, Backwash, Drain, and Winter.
- High Capacity: Accommodates up to 21.5 kg of filter sand.
- Robust Construction: Designed for durability and efficient filtration in outdoor conditions, with a maximum operating temperature of 40 °C.
- Versatile Application: Suitable for pools up to 35 m³, compatible with above-ground and in-ground pools.
3.2 Components
The WilTec Sand Filter system includes the following main components:
- Filter Tank
- 5-Position Multi-Port Valve
- Integrated Pressure Gauge
- Drain Plug
- Filter Support Base
Figure 2: Product Features and Components
4. Setup
4.1 Unpacking and Inspection
Carefully remove all components from the packaging. Inspect for any damage that may have occurred during transit. If any parts are damaged or missing, do not proceed with installation and contact customer support.
4.2 Sand Filling
- Ensure the central pipe with the strainer system is correctly positioned inside the filter tank.
- To prevent sand from entering the central pipe, cover the opening of the pipe with a plastic cap or a piece of cloth.
- Slowly add the recommended amount of filter sand (0.4 to 0.8 mm grain size) into the tank. The maximum filling capacity is 21.5 kg.
- Once filled, remove the cover from the central pipe.
4.3 Connection to Pool System
This filter is designed to be used with a suitable pool pump (not included). Ensure your pump's capacity matches the filter's requirements for optimal performance.
- Position the filter and pump on a stable, level surface near the pool.
- Connect the multi-port valve to the top of the filter tank, ensuring a tight seal.
- Connect the pool's skimmer/main drain line to the 'PUMP' port on the multi-port valve.
- Connect the pump's discharge line to the 'RETURN' port on the multi-port valve.
- Connect the 'WASTE' port on the multi-port valve to a suitable waste line or drainage area.
- Ensure all hose connections are secured with clamps and are leak-free. The filter is easy to connect using its GEKA to G ¾″ male thread adapter.
Figure 3: Filtration System Diagram
Figure 4: Example Application with an Above-Ground Pool
5. Operating Instructions
5.1 Understanding the 5-Position Valve
The multi-port valve allows you to select different operational modes for your filter. Always turn off the pump before changing the valve position.
Figure 5: 5-Position Multi-Port Valve
| Position | Function | Description |
|---|---|---|
| Filter | Normal Filtration | Water flows through the sand bed, trapping debris, and returns to the pool. This is the primary operating mode. |
| Rinse | Post-Backwash Rinse | Used after backwashing to settle the sand bed and flush any remaining dirty water to waste before returning to filter mode. |
| Backwash | Filter Cleaning | Reverses water flow through the sand bed to dislodge trapped debris and send it to waste. |
| Waste | Direct Drain | Bypasses the filter and sends water directly from the pool to the waste line. Useful for lowering pool water level or vacuuming heavy debris directly to waste. |
| Closed | System Off | Shuts off flow to the filter and pool. Use for servicing the pump or filter. |
5.2 Initial Startup
- Ensure the filter tank is filled with sand and all connections are secure.
- Set the multi-port valve to the 'BACKWASH' position.
- Turn on the pump. Backwash for 2-3 minutes or until the water flowing out of the waste line is clear.
- Turn off the pump.
- Set the valve to the 'RINSE' position.
- Turn on the pump. Rinse for 30-60 seconds.
- Turn off the pump.
- Set the valve to the 'FILTER' position.
- Turn on the pump. The system is now operating in normal filtration mode. Note the initial pressure gauge reading for future reference.
5.3 Regular Operation (Filter Mode)
For daily filtration, keep the multi-port valve in the 'FILTER' position. Monitor the pressure gauge regularly. When the pressure rises 0.1-0.2 bar (or 10-20 PSI) above the initial clean filter pressure, it indicates that the sand bed is dirty and requires backwashing.
6. Maintenance
6.1 Backwashing
Backwashing cleans the filter sand. Perform backwashing when the pressure gauge indicates a rise of 0.1-0.2 bar above the normal operating pressure.
- Turn off the pump.
- Set the multi-port valve to the 'BACKWASH' position.
- Turn on the pump. Backwash for 2-3 minutes or until the water flowing out of the waste line is clear.
- Turn off the pump.
- Proceed to the 'Rinse' step.
6.2 Rinsing
Rinsing is crucial after backwashing to settle the sand bed and prevent dirty water from returning to the pool.
- After backwashing, turn off the pump.
- Set the multi-port valve to the 'RINSE' position.
- Turn on the pump. Rinse for 30-60 seconds.
- Turn off the pump.
- Set the valve back to the 'FILTER' position for normal operation.
6.3 Winterization
When preparing your pool for winter, follow these steps to protect your filter:
- Perform a thorough backwash and rinse cycle.
- Turn off the pump and disconnect it from power.
- Set the multi-port valve to the 'CLOSED' or 'WINTER' position (if available) to relieve pressure on the internal components.
- Drain all water from the filter tank by opening the drain plug at the bottom.
- Disconnect all hoses and store them in a dry, frost-free location.
- If possible, store the filter tank in a protected area to prevent freezing damage.
6.4 General Care
- Regularly check all connections for leaks.
- Keep the area around the filter clean and free of debris.
- Inspect the pressure gauge for proper function.
- Replace filter sand every 3-5 years, or more frequently if water clarity issues persist.
7. Troubleshooting
This section provides solutions to common issues you might encounter with your sand filter.
| Problem | Possible Cause | Solution |
|---|---|---|
| Low Water Flow / High Pressure | Dirty filter sand | Perform backwash and rinse cycle. |
| Pump or skimmer basket clogged | Clean pump strainer basket and skimmer basket. | |
| Partially closed valve | Ensure multi-port valve is fully in 'FILTER' position. | |
| Cloudy Pool Water | Insufficient filtration time | Increase daily filtration time. |
| Dirty filter sand | Perform backwash and rinse cycle. | |
| Improper chemical balance | Test and adjust pool water chemistry (pH, alkalinity, sanitizer). | |
| Worn out filter sand | Replace filter sand. | |
| Water Leaks | Loose connections | Tighten hose clamps and fittings. |
| Damaged O-rings or gaskets | Inspect and replace damaged O-rings or gaskets. | |
| Sand Returning to Pool | Damaged internal components (laterals) | Inspect and replace damaged laterals. |
| Improper sand type or amount | Ensure correct sand type (0.4-0.8 mm) and fill level. |
8. Specifications
Refer to the table below for detailed product specifications:
| Feature | Value |
|---|---|
| Product Dimensions (L x W x H) | 33.5 x 33 x 61 cm |
| Product Weight | 4.08 kg |
| Model Number | 51792 |
| Filter Media Type | Sand (0.4 to 0.8 mm grain size) |
| Max. Sand Filling Capacity | 21.5 kg |
| Max. Operating Temperature | 40 °C |
| Recommended Pool Volume | Up to 35 m³ (with suitable pump) |
| Valve Positions | 5 (Filter, Rinse, Backwash, Waste, Closed) |
Figure 6: Product Dimensions
9. Warranty and Support
WilTec products are manufactured to high-quality standards. For warranty information, please refer to the terms and conditions provided at the time of purchase or contact your retailer. If you encounter any issues or require technical assistance, please contact Wiltec customer support or your authorized dealer. Please have your model number (51792) and purchase date available when contacting support.