how to determine what size pool filter you need

Author: PoolKing - Pool Sand Filter Manufacturers

Having a pool can bring endless hours of enjoyment and relaxation to your family and friends. However, it's not just about jumping in the water and splashing around - keeping your pool sparkling clean and safe for swimming is a must. To do that, you need to invest in a quality pool filter. When shopping for a filter, it's essential to make sure that you're choosing the right size to avoid any potential issues with inadequate filtration. In this article, we'll show you how to determine what size pool filter you need.

Why Choosing the Right Pool Filter Size Matters

The size of your pool filter is responsible for the efficiency of the filtration process. It ensures that the pool water stays clean and clear by removing contaminants such as dirt, debris, bacteria, and algae. A filter that is too small for your pool will not be able to effectively remove all of these particles, and your pool water will become dirty and uninviting. In contrast, an oversized filter will result in unnecessary costs, as well as wasting energy as more water than necessary is continually circulated through the system.

Five Key Factors to Consider

Now that you understand why selecting the correct pool filter is so important, let's explore the five primary factors you should consider before making your purchase.

1. Pool Size

The size of your pool is the most important factor in determining what size filter is right for you. The larger the pool, the larger the filter required, as it will need to be able to handle the increased volume of water in the pool.

2. Gallons Per Minute (GPM)

GPM is the rate that your filter will circulate the water in your pool. It's calculated by taking the total volume of your pool and dividing that by the number of hours you want your pool to circulate water. Typically, the recommendation is to circulate the entire volume of water at least once every eight hours. You'll want to select a filter with a GPM rate that's appropriate for your pool's size.

3. Filter Type

There are three primary types of filters: sand, cartridge, and DE. Each filter type has its pros and cons, which you should weigh against your needs when selecting the one that's best for your pool.

4. Pump Type

The type of pump you have will also impact your filter size needs. If you have a variable speed pump, you may be able to get away with a slightly smaller filter than you would need with a single speed pump since the variable speed pump can run at a higher flow rate.

5. Maintenance

Finally, it's essential to consider how much maintenance you are willing and able to perform on your filter. A larger filter may require more frequent maintenance, which can be time-consuming and costly.

Selecting the Right Filter

Now that you've considered all of these factors let's pull it all together to determine what size pool filter you need. Here's a basic rule of thumb to use as a guide:

Above Ground Pools:

- Up to 10,000 gallons: 1 horsepower pump and 16-inch filter

- Up to 20,000 gallons: 1.5 horsepower pump and 19-inch filter

- Up to 30,000 gallons: 2 horsepower pump and 22-inch filter

In-Ground Pools:

- Up to 20,000 gallons: 1.5 horsepower pump and 24-inch filter

- Up to 30,000 gallons: 2 horsepower pump and 30-inch filter

- Up to 40,000 gallons: 2.5 horsepower pump and 36-inch filter

- Over 40,000 gallons: 3 horsepower pump and 48-inch filter

It's always best to speak with a professional to determine which pool filter is the best fit for your specific pool. They will be able to guide you through the process and answer any questions you may have.

Conclusion

Selecting the correct size pool filter is essential for maintaining a sparkling clean pool. By considering the size of your pool, GPM, filter type, pump type, and maintenance needs, you'll be well on your way to selecting the best fit for your pool. Remember to consult a professional to ensure that you choose the right filter size for your unique pool needs.