Choosing the right pool filter involves a systematic approach, ensuring your pool water stays clean and clear. Here's a breakdown of how to select the appropriate filter, based on key considerations:
Steps to Choosing the Right Pool Filter
The selection process, as outlined in the provided reference, includes several key steps:
1. Calculate Pool Volume
- Before anything else, calculate the total volume of your pool in gallons or liters. This number is crucial for determining the necessary filter size.
- Example: A rectangular pool 20 feet long, 10 feet wide, and averaging 5 feet deep would hold approximately 7,480 gallons of water (20 x 10 x 5 x 7.48).
2. Determine Pump Turnover Rate
- Next, determine your desired turnover rate, which is how often all the water in the pool passes through the filter. A common recommendation is once every 8-12 hours.
- Example: If your pool volume is 7,480 gallons and you want the water to be filtered every 8 hours, you would need a pump that processes approximately 935 gallons per hour (7,480 / 8).
3. Determine Filter Flow Rate
- The filter's flow rate needs to be compatible with your pump and desired turnover rate. Make sure the filter's rated flow capacity is slightly higher than the pump's flow rate to ensure effective filtering.
- A too-small filter will not be able to handle the water volume, while a filter that is too large will cycle water too quickly, reducing effective filtration.
4. Select Pool Filter Type
There are three main types of pool filters:
- Sand Filters: These use sand to trap debris. They are low-maintenance and relatively inexpensive.
- Cartridge Filters: These use a paper or fabric cartridge. They provide finer filtration but require regular cleaning and cartridge replacement.
- Diatomaceous Earth (DE) Filters: DE filters provide the finest filtration but are more expensive and require more maintenance.
Table Summarizing Filter Types:
| Filter Type | Filtration Quality | Maintenance | Cost |
|---|---|---|---|
| Sand Filter | Moderate | Low | Lowest |
| Cartridge Filter | Good | Moderate | Medium |
| Diatomaceous Earth | Best | High | Highest |
5. Pool Filter Size
- Once you have the flow rate requirement and selected a filter type, you need to ensure the size is adequate for the pool. A larger filter will generally provide better and more efficient filtration.
6. Adjust the Filter Area and Rate
- Filter area and filtration rate are the technical details for the filter type you choose. For example, a filter with a larger surface area can handle more water while minimizing the pressure against the filter media.
7. Purchase Your New Pool Filter
- Once you have considered all these steps, you are ready to make the final purchase. Ensure that the new filter's specifications align with your pool's needs.
Summary Checklist
- Calculate pool volume.
- Determine your ideal pump turnover rate.
- Match the filter’s flow rate to your pump's flow rate and turnover needs.
- Choose the best filter type for your needs (sand, cartridge, or DE).
- Select a suitable filter size.
By following these steps, you can choose the right pool filter for your pool, keeping it clean and safe for swimming.
