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how to know what size pool filter you need


Author: Poolking - Swimming Pool Equipment Manufacturer

As a pool owner, one of the most important parts of your pool system is your pool filter. It ensures that your pool water remains clean and clear, free of debris and other impurities. However, with so many different types and sizes of filters available, it can be difficult to know what size pool filter you need. In this article, we will provide you with some helpful tips to help you determine the correct size pool filter for your swimming pool.

1. Understanding Pool Filter Sizing

Before we dive into the details of determining the correct size pool filter for your swimming pool, let's take a moment to provide some context around pool filter sizing. The size of your filter is determined by the amount of water that it can handle - typically measured in gallons per minute (GPM). This number will vary depending on the type of pool filter you are considering. Common types of pool filters include sand filters, cartridge filters, and DE (diatomaceous earth) filters.

2. Determining The Right Size Filter For Your Pool

Now that we have established the basics, let's take a closer look at how you can determine the right size pool filter for your swimming pool. One method is to refer to the manufacturer's recommendations based on the size of your pool. They will typically provide sizing charts that indicate the recommended filter size based on the pool's volume (in gallons) and the desired flow rate (in GPM).

3. Calculating The Volume of Your Pool

If you are not able to identify the manufacturer's recommendations for your pool filter, you can calculate the approximate pool volume yourself. This will give you an idea of the size of filter you will need to effectively filter your pool water. The formula for calculating your pool volume is typically as follows:

Pool Volume (in gallons) = Length x Width x Average Depth x 7.5

4. Determining the Desired Flow Rate for Your Pool

In addition to calculating the pool volume, you will also need to determine the desired flow rate for your swimming pool. This can also vary depending on the type of pool filter you have. For example, sand filters typically require a flow rate of 1 GPM per square foot of filter area. Cartridge filters may require a different flow rate, so it is important to check with the manufacturer's recommendations for your specific filter.

5. Choosing the Right Size Pool Filter

Once you have calculated your pool volume and determined the desired flow rate, you can use this information to choose the right size pool filter for your swimming pool. As a general rule, you should choose a filter that is capable of handling at least the same amount of water as your pool's volume. This will ensure that your pool water is effectively filtered and free of debris, leaving you with clean and clear water for swimming.

In conclusion, choosing the right size pool filter for your swimming pool can seem daunting at first. However, armed with the knowledge provided in this article, you should have no trouble determining the correct filter size for your swimming pool. Calculating your pool volume, determining your desired flow rate, and checking the manufacturer's recommendations will all help you make an informed decision and ensure that your pool water stays clean and clear.


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