The swimming pool filter is used for water purification, and there are three main types to choose from: Diatomaceous earth (DE), sand, and cartridge filters. The cartridge filters at Pool Express are able to remove particulate down to about 8-10 microns in size. A cartridge filter’s efficiency is measured by its micron rating, meaning how many microns can pass through the filter. A micron is a unit of length equal to one millionth of a meter (1/1,000,000 m), or 0.0000394 of an inch.Unlike sand and DE pool filters, cartridge swimming pool filters do not require backwashing, a process that can waste a large amount of water and energy. Filters that use a cartridge media trap dirt and debris that pass through the skimmer basket and the hair and lint pot. The filter is ultimately responsible for crystal clear water. 
Hayward Cartridge Filter 50 SF 1.5" Star-Clear C500

Hayward Star-Clear cartridge filters provide crystal clear water and have extra cleaning capacity to accommodate pools and spas of all types and sizes. For replacement or new pool installations, Star-

$277.19
Hayward Cartridge Filter Star-Clear 250 1.5" C250

Hayward Star-Clear cartridge filters provide crystal clear water and have extra cleaning capacity to accommodate pools and spas of all types and sizes. For replacement or new pool installations, Star-

$206.91
Hayward Cartridge Filter Star-Clear Plus 120 1.5" C1200

Star-Clear Plus filters from Hayward deliver quality value and convenience in cartridge filtration. From precision engineering to its reinforced thermoplastic body, Star-Clear Plus filters work hard,

$476.25
Hayward Cartridge Filter Star-Clear Plus 120 2"  C12002

Star-Clear Plus filters from Hayward deliver quality value and convenience in cartridge filtration. From precision engineering to its reinforced thermoplastic body, Star-Clear Plus filters work hard,

$476.25
Hayward Cartridge Filter Star-Clear Plus 175 2"  C17502

Star-Clear Plus filters from Hayward deliver quality value and convenience in cartridge filtration. From precision engineering to its reinforced thermoplastic body, Star-Clear Plus filters work hard,

$608.75
Hayward Cartridge Filter Star-Clear Plus 90 SF 2"  C9002

Star-Clear Plus filters from Hayward deliver quality value and convenience in cartridge filtration. From precision engineering to its reinforced thermoplastic body, Star-Clear Plus filters work hard,

$403.75
Hayward Cartridge Filter Star-Clear Plus 90 SF 2"  C9002S

Star-Clear Plus filters from Hayward deliver quality value and convenience in cartridge filtration. From precision engineering to its reinforced thermoplastic body, Star-Clear Plus filters work hard,

$511.00
Hayward Cartridge Filter Swimclear 325 SF Cart 2" X 1.5" C3025

Utilizing a cluster of four reusable cartridge elements, SwimClear filters offer a choice of 225, 325, 425 or 525 square feet of heavy-duty dirt-holding capacity for extra-long filter cycles, up to an

$942.50
Hayward Cartridge Filter Swimclear 425 SF Cart 2"X1.5"  C4025

Utilizing a cluster of four reusable cartridge elements, SwimClear filters offer a choice of 225, 325, 425 or 525 square feet of heavy-duty dirt-holding capacity for extra-long filter cycles, up to an

$1,071.25
Hayward Cartridge Filter Swimclear 525 SF Cart 2"X1.5"  C5025

Utilizing a cluster of four reusable cartridge elements, SwimClear filters offer a choice of 225, 325, 425 or 525 square feet of heavy-duty dirt-holding capacity for extra-long filter cycles, up to an

$1,325.00
Jandy Cartridge Filter Cl Series 580 SF CL580

Jandy cartridge filters CL Series are simple to use and maintain. Our Jandy cartridge filters provide extra large capacity for extended cleaning cycles. Handy tank lid handles make installation and cl

$1,508.75
Pentair  Clean & Clear 100 SF Cartridge Filter 160316

Clean & Clear Filters feature a chemical resistant tank with no-tool servicing and a coreless cartridge for easier cleaning. All models are equipped with easy spin-on unions for plumbing hook-ups.

$599.00
Pentair  Clean & Clear 150 SF Cartridge Filter 160317

Clean & Clear Filters feature a chemical resistant tank with no-tool servicing and a coreless cartridge for easier cleaning. All models are equipped with easy spin-on unions for plumbing hook-ups.

$620.00
Pentair  Clean & Clear 200 SF Cartridge Filter 160318

Clean & Clear Filters feature a chemical resistant tank with no-tool servicing and a coreless cartridge for easier cleaning. All models are equipped with easy spin-on unions for plumbing hook-ups.

$727.50
Pentair  Clean & Clear 50 SF Cartridge Filter 160314

Clean & Clear Filters feature a chemical resistant tank with no-tool servicing and a coreless cartridge for easier cleaning. All models are equipped with easy spin-on unions for plumbing hook-ups.

$286.95
Pentair  Clean & Clear 75 SF Cartridge Filter 160315

Clean & Clear Filters feature a chemical resistant tank with no-tool servicing and a coreless cartridge for easier cleaning. All models are equipped with easy spin-on unions for plumbing hook-ups.

$443.75
Pentair  Clean & Clear Plus 320 SF Cartridge Filter 160340

Clean & Clear Plus Filters have a corrosion resistant injection molded filter tank featuring superior strength and reliability. The cartridge assembly uses four easy to clean, non-woven, polyester

$973.75
Pentair  Clean & Clear Plus 420 SF Cartridge Filter 160301

Clean & Clear Plus Filters have a corrosion resistant injection molded filter tank featuring superior strength and reliability. The cartridge assembly uses four easy to clean, non-woven, polyester

$1,103.75
Pentair  Clean & Clear Plus 520 SF Cartridge Filter 160332

Clean & Clear Plus Filters have a corrosion resistant injection molded filter tank featuring superior strength and reliability. The cartridge assembly uses four easy to clean, non-woven, polyester

$1,367.50
Sta-Rite  Modular Media Filter 150 SF System 2 PLM150

Sta-Rite's modular media filtration is the perfect match for the small inground and aboveground pool markets. Advances in media technology and balanced flow design provide dirt-loading capabilities up

$677.35 $541.88
Sta-Rite  Modular Media Filter 300 SF System 2 PLM300

Sta-Rite's modular media filtration is the perfect match for the small inground and aboveground pool markets. Advances in media technology and balanced flow design provide dirt-loading capabilities up

$940.00 $752.00
Sta-Rite System 3  Modular Media Filter 300 SF  S7M120

System:3 Modular Media Filters handle 2-3 times more dirt than other filters to deliver maintenance-free performance for up to a full season. Featuring perfectly balanced flow and an integral manifold

$1,098.75 $879.00
Sta-Rite System 3  Modular Media Filter 450 SF  S8M150

System:3 Modular Media Filters handle 2-3 times more dirt than other filters to deliver maintenance-free performance for up to a full season. Featuring perfectly balanced flow and an integral manifold

$1,442.50 $1,154.00

As previously mentioned, a swimming pool filter’s efficiency is measured by its micron rating. To put this into perspective, a grain of ordinary table salt is about 100 microns, and the human eye can see down to about 35 microns without the aid of magnification. The lower the micron rating on the filter, the smaller the particles it can remove from the water.

These filters generally function the same way as other types of pool filters. After the water is pushed through the skimmer, it’s pumped through the filter tank and then through cartridge. Then the filtered water is returned to your pool. Keep in mind that this type of filter needs to be disassembled and cleaned regularly throughout the swim season. Even with a filter in place, you’ll still need to maintain your pool’s chemical levels with a proper sanitation system. A swimming pool filter is designed to only filter out small contaminants from the water, not sanitize it. 

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