Pool Filter Cartridges

Pool Filters Size Rating Demystified What They Mean and How to Choose

pool filter

Have you ever found yourself staring at cartridge pool filter size ratings, struggling to understand what they mean? Don’t worry – you’re not alone. Filter size ratings can be confusing, but they are a crucial factor in choosing the right filter for your needs. In this blog post, we’ll demystify filter size ratings and explain everything you need to know about them. By the end of this post, you’ll be able to confidently choose the perfect filter for your project or equipment!

Types of Pool Cartridge Filter Sizes

There are two types of pool filters—sand and cartridge. Sand filters use, you guessed it, sand to remove debris as water is pushed through the filter and back into your pool. Cartridge filters do the same job but instead, use a pleated paper filter to collect dirt and debris.

Most residential pools will come with a sand or cartridge filter because they’re less expensive than other options on the market. The size of your pool filter is important because if it’s too small, it won’t be able to keep up with the water flowing into your pool and could get clogged. A clogged filter means your pump has to work harder, which could lead to premature failure.

To find out what size pool filter you need, simply match the square footage of your pool with the flow rate (GPH) of your pump. Most residential pools have a GPH between 1,500-3,000. For example, if you have a 20,000 gallon pool and a 2,000 GPH pump, you would need a sand or cartridge filter that is at least 50 square feet.

Once you know the square footage of your pool and the GPH rating of your pump, you can easily find a pool filter that will suit your needs.

Understanding the Filters Size Rating System

When you are shopping for a new Cartridge Pool Filter, it is important to understand the size rating system. This will help you choose the right size filter for your pool.

The size rating of a filter for pool is based on the total surface area of the cartridge. The larger the surface area, the higher the size rating. For example, a filter with a surface area of 100 square feet would have a size rating of 100.

filter pool parts

The size rating is important because it determines how much water can flow through the filter. The higher the rating, the more water can flow through the filter. This is important because it allows the filter to remove more dirt and debris from the water.

To determine the size of filter you need, you first need to know the square footage of your pool. Once you have that number, you can choose a filter with a size rating that is equal to or greater than that number.

For example, if your pool is 1,000 square feet, you would need a filter with a size rating of 1,000 or higher. If your pool is 10,000 square feet, you would need a filter with a size rating of 10,000 or higher.

How to Choose the Right Pool Cartridge Filter for Your Application

There are a few things to consider when purchasing a pool filter system. The size of the filter is important, as is the type of pool you have. Here is a guide to help you choose the right pool cartridge filter for your application.

The size of the pool is one of the most important factors to consider when choosing a pool cartridge filter. The capacity of the filter should be able to handle the amount of water in your pool. If you have a small above ground pool, you will need a smaller filter than if you have a large in-ground pool.

The type of pool you have will also affect the size of the filter you need. If you have a saltwater pool, you will need a larger filter than if you have a freshwater pool. This is because saltwater pools require more filtration power to remove the salt from the water.

Another factor to consider when choosing a pool cartridge filter is the flow rate. The flow rate is how fast water flows through the filter. A higher flow rate means that more water can be filtered in a shorter amount of time. This is important if you have a lot of swimmers in your pool or if your pool gets dirty quickly.

Consider the price when choosing a pool cartridge filter. Filters can range in price from a few hundred dollars to several thousand dollars. It is important to find a balance between price and quality when choosing a filter. A good quality filter will last longer

Alternatives to Pool Filter Cartridges with Size Ratings

If you aren’t sure what size filter you need, or you are looking for an alternative to traditional filter cartridges, there are a few things to consider. There are many factors that go into choosing the right size filter cartridge, including the type of pool, the size of the pool, and the type of filtration system you have.

The first thing to consider is the type of pool you have. Above ground pools and inground pools have different size requirements for their filters. Make sure to measure your pool before purchase so that you get the right size cartridge.

Sand filters use sand to trap dirt and debris, while cartridge filters use a pleated paper or cloth element to do the same thing. Both types of filters will need to be replaced periodically, but cartridge filters will need to be replaced more often than sand filters.

When it comes to choosing a replacement filter cartridge, there are a few things to keep in mind. First, make sure to get the right size cartridge for your pool and filtration system. Second, choose a cartridge made from quality materials that will last longer and provide efficient filtration.

Benefits/Limitations of Different Pool Filters Sizes

While cartridge filter for pool come in a range of sizes, the most common size categories are 20, 30, 40, and 50. The number corresponds to the filter’s ability to effectively remove particles from your pool water; the higher the number, the more debris it can remove.

There are benefits and limitations to each size filter. For example, a 20-micron filter is less likely to clog than a 40- or 50-micron filter. However, it will also allow smaller particles of debris into your pool water. A 40- or 50-micron filter will capture more debris but will require more frequent cleaning.

Ultimately, the size of the filter you choose should be based on your pool’s usage and desired level of cleanliness. If you have a heavily used pool with lots of swimmers, you may want to opt for a larger filter. If you have a lightly used pool or one that is mainly used for leisurely swimming, a smaller filter may suffice.

Poolpure Pool and Spa filters are tested and certified by IAPMO against NSF/ANSI 50. Innovated “Dirt-Locking” technology makes the fabric trap much more contaminants than regular fabric. This filter efficiently removes hair, leaves, dust, sediment, sand, etc.


When it comes to filter size ratings, understanding their meaning and how to choose the correct one can be complicated. However, we hope that this article has helped shed some light on the different sizes available and what factors go into choosing the best one for your needs. After reading through our helpful guide, you should now have a better idea of which filter rating is right for your project or application. So go out there and get yourself the right sized filter today! Of course, you can also turn to our online customer service to find a suitable replacement for your filter pool parts in PUREPLUS.

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