How Often Should You Clean a Pool Filter?
No single schedule suits every pool. Your filter's pressure gauge or indicator is a better guide than the calendar, along with the manual for your exact model.
Watch the pressure, not the calendar
Pentair’s Clean & Clear manual uses the pressure reading with a clean filter as a baseline. Check your own manual for how much of a rise signals it’s time to clean.
Some filters have a built-in clean/dirty indicator, such as Zodiac's CS cartridge filters. No pressure figure applies to every filter, so check your own manual.
What makes a filter clog faster
Storms, leaves from nearby trees and busy swimming periods can all fill a filter more quickly. Check it more often after wild weather or a big weekend in the pool.
Cartridge and sand filters are different
Cartridge filters are generally cleaned, while sand filters are usually backwashed. The steps vary between models, so follow the manual for your filter.
If you're unsure, get help
Filters can hold pressure, and opening one the wrong way can be dangerous. If you're not confident, get professional help rather than taking it apart.
If the water stays cloudy even with a clean filter, circulation or water chemistry may also be involved. Regular maintenance can help catch filter problems early.
Sources
Related guide: Why is my pool cloudy?
Regular pool maintenance