How to Choose the Right Size Pool Filter

When choosing a filter, whether it be Sand, D.E. or Cartridge, you’ll have to decide on the right size pool pump for your pool. Filter size is important and something you’ll want to consider to avoid potential problems in the future.
There are usually 4 or 5 types of filter sizes. The smallest for above-ground pools, mid-range for small pools around 15,000 gallons, and large filters for large pools above 25,000 gallons. This is pretty straight forward, but you’ll want to make sure your filter size is not too small when compared to your pump.The most important factor when determining filter size is the GPM or Gallons Per Minute your pool pump puts out. This number directly effects which type of filter size you’ll need. The flow rate on the filter should be higher than the GPM of your pool pump. The other way around can cause problems for your system. For example, a filter that is too small for a pool creates high amounts of pressure. The high amount of pressure pushes debris back in your pool and can crack or damage your pool filter.

A good rule to remember is bigger, in this case, is better. Although larger filters come with a bigger price tag, they provide better filtering and easier maintenance for pool owners.

Benefits of larger filters:
  • Increased time between cleaning and backwashing
  • Increased filtration of small particles
  • Increased longevity of filter media

So when it comes to choosing a filter size, 1st determine the gallons per minute your pump is currently distributing. Then, determine the filter size that makes the most sense to you. If your budget is tight, you may want to go with a filter that has a flow rate just above the GPM (gallons per minute) rating. However, if you have a bigger budget, a larger pool filter will give you better water with less maintenance.

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When Kevin’s not enjoying the water himself he’s engaging himself in the wide world of pool and spa knowledge which he passes on to our customers through producing content for our blogs and website. Outside of the pool world you can find him enjoying life with friends, family and his off the wall dog Brixton.