Pool Filter Size Calculator

Pool Filter Size Calculator

A Swimming Pool Chemical Calculator

Fill out the fields below to calculate the pools minimum required filter area.
Input is not a number!
Input is not a number!

The maximum pump flow rate and filter media rate can be found on the equipment or in the manual. The equipment manufacturers also list specs on their websites.

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READ: Pool Filters: Understanding Types, Benefits, and Drawbacks

Common Filter Media Rate
High-Rate Sand: 5 - 20 gpm/ft2
Cartridge: 0.375 gpm/ft2
Diatomaceous Earth(DE): 2 gpm/ft2

It is always recommended to oversize the pool filter. Adequate filtration is the primary source of clean clear pool water. An undersized filter can lead to numerous problems, including cloudy pool water, increased chemical demands, pH swings, and unsafe swimming pool water.

Maximum pump gpm must be used when calculating the minimum required filter area. Exceeding the filter media rate will result in many negative effects to the equipment and poor pool water quality.

READ: Understanding Turnover Rate in Swimming Pools: A Comprehensive Guide to Efficient Water Circulation
READ: Pool Filters: Understanding Types, Benefits, and Drawbacks

More About Pool Filter Size and Filter Media Rate

Choosing the right filter:

Each pool filter media has its own unique advantages and disadvantages. Selecting the right one requires consideration of user load, pump max gpm, flow rate, filter media rate, installation location, filter size, maintenance and local code requirements on turn over rate.

An improperly sized filter can lead to cloudy and dirty water. Ensuring the main drain cover is in place, and intact is impossible in cloudy pool water. Being able to visually inspect the main drain cover is important. Not being able to see a swimmer in distress at the bottom because of cloudy pool water is extremely dangerous.

READ: Backwashing a Pool Filter: A Comprehensive Guide
High-Rate Sand Filter Media:

Pool filter sand media is one of the oldest methods of purifying water. Debris, algae, and contaminants get trapped between the sand particles as the pool water passes. High-Rate Sand filters clean particles down to 25-100 micron range. High-Rate sand filter maintenance requires backwashing to clean out the debris and prevent channeling.

Cartridge Filter Media:

Pool cartridge filters clean down to the 10-15 micron range. Replacement and maintenance are easier compared to a sand filter. There is no need for backwashing, cartridge filters are easily removed and cleaned or just replaced. These filters reduce energy cost by the reduced pressure required to operate. Saving on energy and equipment use.

READ: A Comprehensive Guide to Cleaning Your Home Swimming Pool DE Filter
Diatomaceous Earth(DE) Filter Media:

Diatomaceous Earth or DE provides the best filtration at 1-2 microns. DE's made from fossils called diatoms. Its a fine white powerer that is poured into the skimmer and trapped by a fabric forming a thin layer that traps debris and contaminants but allows water to pass. Maintenance can be tricky and should be handled by a professional for best results.

READ: Troubleshooting and Fixing Air in Your Pool Lines: A Comprehensive Guide for Homeowners

Take note of the pressure side psi when first installing the filter. Once the pressure rises over 10 psi past original installation pressure, its time to clean the filter.

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