How often should I backwash?

[Neemer]

The pressure in my filter has not risen enough to justify backwashing (15% incr) in nearly a month. Does this sound right?

 

[Richard320]

Easily. I only backwash twice a year.

 

[Neemer]

Holy cow. Thanks Richard.

 

[ajw22]

DE filters need more regular back washing then sand filters.

 

[Saturn94]

With my oversized DE filter I never have to backwash during the season. I take it apart and give it a thorough cleaning at fall closing, then recharge it with new DE at spring opening. That’s it, easy peasy!

I believe the guideline here is to backwash when pressure rises 25% over clean filter pressure.