How Often Should I Clean or Backwash My Pool Filter?

Quick answer: Clean or backwash your pool filter when the pressure gauge rises about 8 to 10 psi above its clean starting reading, not on a fixed schedule. Check the gauge weekly.

How to do it

• Record the clean pressure after a fresh cleaning or backwash
• Cartridge: turn the pump off, remove the cartridge, hose between the pleats, and reinstall with the o-ring seated
• Sand: set the valve to backwash for about 2 to 3 minutes until the sight glass clears, rinse about 30 seconds, then return to filter
• DE: backwash and recharge with DE per the manual
• Always turn the pump off before changing the valve position

When to replace media

• Pressure climbs again quickly after cleaning
• Cartridge pleats are frayed or collapsed
• Sand or DE grids are worn per your manual

When to call a pro

If pressure stays high after cleaning, a pro can check valves, laterals, and media.