Understanding Different Types of Pool Filters

A pool filter is one of the most important components of any swimming pool system. It helps remove dirt, debris, and microscopic particles from the water, keeping it clean and clear. There are three main types of pool filters, each with its own strengths and maintenance needs. Here’s a breakdown of each type to help you choose the best one for your pool.

Sand Filters

Sand filters are one of the most popular and budget-friendly options. They use specially graded sand to trap particles as water flows through. The sand traps debris as small as 20-40 microns (a micron is one-millionth of a meter).

• Pros: Sand filters are affordable, durable, and relatively easy to maintain. They’re also ideal for large pools because they can handle high flow rates.
• Cons: Sand filters aren’t as efficient at capturing very small particles compared to other filter types. You’ll need to “backwash” the filter (reverse the water flow) to clean it about once a week, and the sand should be replaced every 5-7 years.
• Ideal For: Pools with higher traffic or those that need a low-maintenance option.

Cartridge Filters

Cartridge filters use a replaceable cartridge made of polyester or similar materials to filter out particles as small as 10-15 microns. Water passes through the cartridge, where dirt and debris are trapped in the filter material.

• Pros: Cartridge filters offer excellent filtration, capturing smaller particles than sand filters. They require less frequent cleaning and don’t need backwashing, which conserves water. Cartridges can be removed and hosed off when they get dirty, usually every 2-4 weeks.
• Cons: Cartridge filters tend to be more expensive than sand filters, and the cartridges need to be replaced every 1-2 years. Cleaning can be time-consuming, especially if you have a larger pool.
• Ideal For: Pools that need finer filtration and are in areas with water restrictions, as they don’t require backwashing.

Diatomaceous Earth (DE) Filters

DE filters use a powder made from fossilized remains of tiny aquatic organisms called diatoms. This powder coats a grid inside the filter and can capture particles as small as 2-5 microns, providing the best filtration of all three types.

• Pros: DE filters provide the clearest water possible, making them a top choice for those who want superior water clarity. They capture the smallest particles, which is beneficial for pools that see frequent use or are prone to fine debris.
• Cons: DE filters are the most expensive option and require regular backwashing to clean. After backwashing, you’ll need to add more DE powder, which can be an extra step. Some areas have restrictions on DE disposal, so be sure to check local regulations.
• Ideal For: Pools where water clarity is a top priority or those in areas with a lot of fine debris like dust or pollen.

This post was written by a professional at Clear Tech Pools. Clear Tech Pools has expert Bradenton pool contractors. Our company was founded by local residents on the principles of hard work, exceptional customer service and a focused attitude. It is these qualities, along with our outstanding performance that keeps our customers satisfied. We have built, renovated and serviced thousands of pools in the area, and we have a long list of references available for all of our services upon request. Our staff of professional technicians have extensive training for fast and efficient service. We maintain our excellent reputation for quality by maintaining friendly relationships with our customers.