Swimming Pool Filter Sizing

There is a formula for anything that you need to accomplish with regards to swimming pools, spas and hot tubs. Whether it’s a chemical adjustment or a piece of equipment that you need to replace and you want to be sure it’s the right size.

This article, as is stated in the title, is about choosing the right swimming pool filter to be sure that you’re getting the best performance and clearest pool water. Filters are one example when bigger is better!

           Flow Rate / Filter Ability = Filter Size

Filter Ability for the different types of filters are as follows:

D.E. = 2 GPM per square foot

Cartridge = 0.375 GPM per square foot

Sand = 15 GPM per square foot

Ex: 75 GPM

Filter size for D.E., Cartridge and Sand would be:

75 / 2 = D.E ……. 37.5 sq ft

                 

    

75 / 0.375 = Catr. …. 200 sq ft

75 / 15 = Sand …… 5 sq ft

Article by: Jef Kirchmaier, CPO, CPT, AEA, WQM

                 

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