How Swimming Pool Filtration Work

How Swimming Pool Filtration System works?

Table of Contents


The summer season has started and so does the pool season. The Swimming pool is one of the favorite places for most people to relax on a hot summer day. But, struggling to keep the water clean? Don’t Worry! You don’t have to think about the dirty swimming pool this summer. Mentor Water brings the solution for you all: A Filtration System.  

The swimming pool filtration system helps to keep the water clean and prevent the growth of debris, bacteria, and viruses. The main goal of filters is to keep the water clear and safe. In this blog, we will understand how filtration works to keep your pool clean throughout the season.

Components of Swimming Pool Filtration System

Swimming Pool Filtration System

Before understanding the filtration process, first, let us look into the main components of the filtration system. 

1. Skimmers and Main Drains

Skimmers are found at the pool’s surface, which helps to remove leaves, insects, and floating debris. 

The main drain is located at the bottom of the pool, which helps to remove the settled dirt and debris from the floor. 

2. Pump

The pump is the main component of the filtration system. It creates the pressure to draw water from the skimmers and main drains and then forces it through the filter.  

3. Filters

There are three types of pool filters: Sand, Cartridge, and Diatomaceous Earth Filters.

  • Sand Filters: It is one of the most common types of filters that is used in most homes. In this filter, water is passed through the tank filled with water which helps to filter out debris and particles. After the cleaning process of the water, water is flowed back into the pool from the bottom of the filter. It is one of the cheapest pool filters that requires low maintenance. The sand in the filter needs to be replaced once in 3 to 5 years. 
  • Cartridge Filters: The water is filtered using a replaceable cartridge. Cartridge filters can remove particles of size 5 to 20 micrometres. The maintenance of the filter depends on the pool size, amount of debris, and sunscreen. Generally, these filters need to be cleaned once every 3 to 4 months. The lifespan of a cartridge filter is one to three years depending on the manufacturer. 
  • Diatomaceous Earth (DE) Filters: It is one of the most efficient filters. DE filters use a powder made from fossilized diatoms. This powder coats a grid inside the filter and traps even the smallest particles, providing superior water clarity. These filters require regular maintenance, making them the most expensive pool filter. 

4. Return Lines

These are the pipes that draw the filtered water back into the pool. These lines ensure the equal distribution of chemicals in the pool. 

The Filtration Process

Swimming Pool Filtration Process

The filtration process starts with the pump drawing water from the water through the skimmers and main drains. This helps to trap the large debris and particles from the surface and bottom of the pool. The pump then draws water from both skimmers and the main drain. 

The water then passes through the filter like a sand filter, cartridge filter, or diatomaceous Earth (DE) Filter, which removes impurities. 

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Note: Filter depends on the needs of the size, amount of debris, and water exposure to sunscreen. Therefore, before choosing the right filter for your swimming pool, seek help from the manufacturer. 

After filtration, the clean water is pumped back into the pool through the return lines. These lines are placed strategically to ensure equal distribution of clean water in the pool, helping to maintain consistent water quality and clarity. 

Two Important Points That Should Be Considered

  • Circulation: Continuous water movement is necessary for effective filtration. Most of the pools come with an integrated timer that runs the pump for a few hours every day to make sure the whole volume of water is consistently filtered. 
  • Backwashing: For sand and DE filters, backwashing is a necessary maintenance step. It involves reversing the flow of water through the filter to flush out trapped debris. Cartridge filters are cleaned by removing and rinsing the cartridge with a hose.

Maintenance Tips

To maintain the smooth functioning of your filtration system, regular maintenance is important: 

  • Check and Clean the Skimmers: Remove any debris from the skimmer baskets regularly.
  • Monitor Filter Pressure: An increase in pressure indicates the filter is becoming clogged and needs backwashing or cleaning.
  • Maintain Chemical Balance: Regularly test and adjust the pool’s chemical levels to prevent algae growth and bacteria buildup.


enjoy crystal-clear and safe water with swimming pool filtration system

A swimming pool filtration system is a complex but effective device. It helps to keep the water safe and clean. Therefore, with the help of a filtration system, you can enjoy crystal-clear and safe water.  

Mentor Water offers a wide array of products and services covering everything you need to craft the perfect pool, whether for hotels, resorts, or homes! From the initial idea and design to the construction and ongoing upkeep, we have a complete set of services to turn your pool dreams into reality. 

If you are still confused, contact Mentor Water at 7351002123. Our team will assist you in choosing the best filter for your pool and providing regular maintenance. 

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