how does pool filter work

Author: Poolking - Swimming Pool Equipment Manufacturer

How Does a Pool Filter Work?

If you're a pool owner, then you know that keeping it clean and clear is important for the safety and enjoyment of the swimmers. In order to achieve this, a pool filter is essential. But have you ever wondered how a pool filter actually works? In this article, we'll take a deep dive into the world of pool filters and discuss the different types, how they work, and some tips for maintaining them.

Types of Pool Filters

There are three main types of pool filters: sand, cartridge, and diatomaceous earth (DE). Although they all serve the same purpose, they each have their own unique features and benefits.

1. Sand Filters: These are the most commonly used type of pool filter. They are relatively inexpensive and easy to maintain. Water is pumped through a bed of sand, which traps the dirt and debris. When the sand becomes too dirty, it is backwashed (reversed flow) to remove the debris and reset the sand bed.

2. Cartridge Filters: These filters use a pleated fabric cartridge to trap dirt and debris. They are more expensive than sand filters, but they offer better filtration and require less maintenance. When the cartridge becomes too dirty, it is removed, hosed off, and replaced.

3. DE Filters: These are the most expensive type of pool filter, but they also offer the best filtration. DE is a fine white powder that coats a series of grids inside the filter tank. As water passes through the grids, the DE traps dirt and debris. When the pressure in the filter tank rises, the DE needs to be recharged by adding more to the filter.

How Pool Filters Work

Now that you know the different types of pool filters, let's discuss how they work. All pool filters work on the same principle: water is circulated through the filter, and dirt and debris is removed. The pool pump is responsible for pumping water through the filter and back into the pool.

In a sand filter, the water is forced through a bed of sand, which traps the dirt and debris. As the sand becomes clogged with debris, the pressure inside the filter tank rises. When the pressure reaches a certain level, the backwash valve is opened, and water is forced through the filter in the opposite direction. This flushes out the dirt and debris and resets the sand bed.

Cartridge filters work in a similar way. The water is forced through a pleated fabric cartridge, which traps the dirt and debris. When the cartridge becomes dirty, it needs to be removed, hosed off, and replaced.

In a DE filter, water is forced through a series of grids coated with DE. As the water passes through the DE-coated grids, dirt and debris are trapped. When the pressure inside the filter tank rises, the DE needs to be recharged by adding more to the filter.

Maintaining Your Pool Filter

In order for your pool filter to work properly, it needs to be properly maintained. Here are some tips for maintaining your pool filter:

1. Backwash or clean your filter regularly, depending on the type of filter you have.

2. Check your filter's pressure gauge regularly. If the pressure is too high, it's time to backwash or clean the filter.

3. Check your filter's skimmer basket and pump basket regularly. This will prevent large debris from clogging your filter.

4. If your pool has heavy use or a lot of debris, consider upgrading to a larger filter.

5. Have your pool filter inspected and cleaned by a professional once a year.

Conclusion

A pool filter is an essential part of keeping your pool clean and clear. With so many different types of filters to choose from, it's important to choose the one that's right for your pool and your budget. By understanding how your pool filter works and properly maintaining it, you can ensure that your pool stays clean and safe for swimming.