What size pool filter do I need? This is a common question for customers who want to replace or buy a new pool filter.
In theory, It doesn’t matter, You can use any size of pool filter with any size of pool.
What changes is the time between two cleaning. Pool filter size is more about the frequency of the cleaning cycle. So,
What Size Pool Filter Do I Need?When it comes to choosing the right pool filter remember this principle. ‘’Smaller the pool filter more frequent cleaning (Maintenance), Bigger the pool filter less frequent cleaning.’’
Quick Answer to your query,

5000 Gallon Pool – 100 sq. ft.10000 Gallon Pool – 200 sq. ft.12000 Gallon Pool – 200-300 sq. ft.15000 Gallon Pool – 200-300 sq. ft.20000 Gallon Pool – 300-400 sq. ft.25000 Gallon Pool – 400 sq. ft.30000 Gallon Pool – 400-500 sq. ft.40000 Gallon Pool – ≥ 500 or Dual Filter System
* The first number is how many gallons of water your pool has.* And the second one is what size of Cartridge pool filter you need.
This is the standard cartridge pool filter size according to your pool volume. I recommend oversizing of cartridge filter.
In general ‘Bigger Is Better’. Don’t buy too small or too big a pool filter for your pool.
Why? Let’s understand…
How To Choose Right Pool Filter Size For A Pool?When it comes to choosing the right pool filter size for above ground pool or inground pool you he to understand some key metrics like
Pool Volume, GPM, Type of Filter, Pump Turnover Rate, Head Resistant, and Filter Flow Rate.
Let’s Understand one by one.
Steps To Select the Right Pool Filter SizeCalculate Pool Volume ↓
Determine Filter Flow Rate ↓
Select Filter Type ↓
Choose The Filter Size ↓