1. Introduction and Product Overview
The SWIMLINE HYDROTOOLS 24 Inch Sand Filter Combo Set is designed to provide efficient and consistent water filtration for above-ground and in-ground pools. This system is engineered to optimize filtration, ensure consistent performance, and facilitate efficient backwashing, contributing to exceptionally clean water quality.
This specific model is a "Tank Only" unit, featuring a durable 24-inch molded tank with a 300-pound sand capacity, suitable for pools up to 22,000 gallons. It includes the tank, filter base, and a 6-way multi-port valve, allowing for a modular replacement or new installation.

Image 1.1: Visual representation of water clarity improvement. The left side shows a pool with cloudy, green water, while the right side displays the same pool with crystal clear, blue water, demonstrating the effectiveness of the Hydrotools sand filter.
2. Safety Information
Please read and understand all instructions before installing, operating, or performing maintenance on this product. Failure to follow these instructions could result in serious injury or property damage.
- Always disconnect power to the pump before performing any service or maintenance.
- Ensure all electrical connections are made by a qualified electrician and comply with local codes.
- Do not operate the filter system if any parts are damaged or missing.
- Keep children and pets away from the filter system during operation.
- Do not exceed the maximum operating pressure specified for the filter.
- Always relieve pressure from the filter before opening the multi-port valve or performing any service.
3. Package Contents
Verify that all components listed below are present in your package. If any parts are missing or damaged, contact Swimline customer service immediately.
- Sand Filter Tank
- Filter Base
- 6-Way Multi-Port Valve
- Pressure Gauge
- Sight Glass
- Drain Valve
- Laterals / Internal Pipe Assembly

Image 3.1: An exploded view of the Hydrotools sand filter components, including the multi-port valve, filter tank, base, pressure gauge, sight glass, drain valve, and the internal lateral assembly.
4. Setup and Installation
This section outlines the general steps for setting up your sand filter. Refer to the detailed diagrams for proper assembly. Ensure the filter is placed on a firm, level surface, preferably concrete, and as close to the pool as possible.
- Positioning the Filter: Place the filter tank on its base in the desired location.
- Adding Filter Sand: Remove the multi-port valve and internal pipe assembly from the tank. Carefully pour the recommended amount of filter sand (approximately 300 lbs for this 24-inch tank) into the tank. Ensure the internal pipe is centered during this process.
- Installing the Multi-Port Valve: Carefully place the multi-port valve onto the top of the tank, aligning it with the internal pipe. Secure the valve to the tank using the provided clamp or bolts.
- Connecting Plumbing: Connect the pool's skimmer line to the "PUMP" port on the multi-port valve. Connect the pool's return line to the "RETURN" port. Ensure all connections are tight and leak-free.
- Installing Pressure Gauge and Sight Glass: Thread the pressure gauge into the designated port on the multi-port valve. Install the sight glass into its port.
- Initial Startup: Before starting the pump, ensure the multi-port valve is set to "BACKWASH" and the pool is filled to the appropriate level. Backwash the filter until the water in the sight glass runs clear. Then, set the valve to "RINSE" for 30-60 seconds, followed by "FILTER" for normal operation.
Note: This product is a "Tank Only" set. A separate pool pump is required for operation. The recommended Hydrotools pump for this set is Item #722061.

Image 4.1: An installed Hydrotools sand filter system positioned next to an above-ground pool, illustrating typical setup and plumbing connections.
5. Operating Instructions
The 6-way multi-port valve allows for various operational modes. Always turn off the pump before changing valve settings to prevent damage to the system.
- FILTER: This is the normal operating mode for filtering pool water. Water flows through the sand bed, trapping debris, and returns clean water to the pool.
- BACKWASH: Used for cleaning the filter sand. Water flows in reverse through the sand bed, dislodging trapped debris, and exits through the waste port. Perform backwash when the pressure gauge reading is 8-10 PSI above its clean operating pressure.
- RINSE: Used after backwashing to settle the sand bed and flush out any remaining dirty water from the filter before returning to filter mode.
- WASTE: Bypasses the filter and sends water directly out the waste port. Useful for quickly lowering pool water level or vacuuming heavy debris directly to waste.
- RECIRCULATE: Circulates pool water without filtering it through the sand. Useful for distributing chemicals without filtering.
- WINTER: Used for winterizing the filter system. This position typically drains the valve and prepares it for cold weather storage.

Image 5.1: Detailed view of the multi-port valve, highlighting its various settings for different operational modes of the sand filter.
6. Maintenance
Regular maintenance ensures optimal performance and longevity of your sand filter system.
- Backwashing: Perform backwashing regularly as indicated by the pressure gauge. This removes trapped debris from the sand bed.
- Sand Replacement: Filter sand typically lasts approximately 5 years with proper maintenance. Replace the sand when filtration efficiency decreases significantly, even after backwashing.
- Pressure Gauge Monitoring: Regularly check the pressure gauge. A rising pressure indicates the filter needs backwashing.
- Winterizing: Before freezing temperatures, properly winterize your filter system according to the "WINTER" valve setting instructions and local guidelines to prevent freeze damage.
- General Cleaning: Keep the exterior of the filter tank and valve clean. Periodically inspect hoses and connections for leaks or wear.

Image 6.1: Information regarding the lifespan of filter sand, indicating that it can last up to 5 years with proper care, emphasizing cost-efficient filtration.
7. Troubleshooting
This section provides solutions for common issues you might encounter with your sand filter system.
| Problem | Possible Cause | Solution |
|---|---|---|
| Low Water Flow / Poor Filtration |
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| Cloudy Pool Water |
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| Water Leaking from Valve/Connections |
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8. Specifications
Key specifications for the SWIMLINE HYDROTOOLS 24 Inch Sand Filter Combo Set (Model 72400):
- Model Number: 72400
- Tank Size: 24 inches
- Sand Capacity: 300 pounds
- Maximum Pool Size: Up to 22,000 gallons
- Product Dimensions: 40.6 x 23.8 x 23.8 inches
- Item Weight: 40.5 pounds
- Manufacturer: Swimline

Image 8.1: Dimensional overview of the sand filter tank, including its height and width, along with its sand capacity and recommended pool size.
9. Warranty and Support
For warranty information, technical support, or to order replacement parts, please contact Swimline customer service. Keep your purchase receipt and model number handy for faster service.
Swimline Customer Service: Refer to the contact information provided on the product packaging or the official Swimline website.
Swimline is a New York, USA-based, family-operated business with over 50 years of experience, dedicated to providing reliable pool care solutions.

Image 9.1: Information about Swimline, highlighting their experience, US-based operations, and commitment to customer service.





