what does a pool filter do


Author: Poolking - Swimming Pool Equipment Manufacturer


If you are a pool owner, you already know how important it is to maintain the cleanliness and hygiene of your pool. Having a pool filter installed is one of the fundamental aspects of keeping your pool water clean and safe for swimming. But what does a pool filter do exactly? Let's explore more about the importance of a pool filter and how it works.

The Basic Function of a Pool Filter:

A swimming pool filter is an essential component of your pool's circulation system. Its job is to remove the unwanted debris from your pool water such as leaves, insects, dirt, and other fine debris. The filter works by trapping these particles and preventing them from recirculating in the pool water, thus keeping it clean and clear.

Types of Pool Filters:

There are three primary types of pool filters: sand, cartridge, and diatomaceous earth (DE) filters. Each type has its unique advantages and disadvantages, based on your specific requirements, the size of your pool, and your budget; you can choose the right type of filter for your pool.

Sand Filters:

Sand filters contain a bed of silica sand, which traps the particles as the water passes through it. Sand filters are the most commonly used type of pool filter due to their low cost and low maintenance. One of the main drawbacks of sand filters is they are not as efficient as cartridge and DE filters in removing smaller particles.

Cartridge Filters:

Cartridge filters use pleated cartridges to trap the debris from the pool water. They are more efficient than sand filters, and they require less maintenance. Cartridge filters are more expensive than sand filters but have a longer lifespan and are more effective in maintaining clean pool water.

Diatomaceous Earth (DE) Filters:

DE filters are the most expensive but the most efficient type of pool filter. DE filters use diatomaceous earth powder to coat a grid, which traps the smallest of debris from the pool water. DE filters are the best option for larger pools or pools with high levels of debris.

Regular Maintenance:

Regardless of the type of filter you use, regular maintenance is critical to ensure optimal performance. Without proper maintenance, the filters will lose their effectiveness and may even cause pool problems such as cloudy water, algae growth, and even bacteria build-up.


A pool filter is an essential component of your pool's circulation system, responsible for keeping your pool water clean and safe for swimming. Choosing the right type of filter for your pool's size, volume, and usage is essential. Regular maintenance is necessary to keep your filter operating effectively and efficiently, ensuring that your pool water remains clean and clear throughout the swimming season.


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