5 Things to Know About Backwashing a Pool Filter

Backwash when pressure rises 8–10 psi above clean starting pressure That is the only signal you need. Anything else is overcomplicating it.

The process takes about 3 minutes Turn off the pump, set the valve to “backwash,” turn the pump back on, and run until the sight glass clears. Then shut off, switch to “rinse” for 30 seconds, and return to “filter.”

Do not skip the rinse step It prevents dirty water from blowing back into the pool. Skipping it is a common mistake.

If pressure stays high after backwashing, try it again Most people do not backwash aggressively enough. If that fails, use a sand filter cleaner or degreaser.

Replace about 10% of the sand once a year That is normal loss. Backwashing is your main routine, and annual sand top-ups keep it working.