Hayward 2030 when to clean?

[Chu1ck]

I opened my pool almost two months ago. The filter pressure has gone up some in the last two months but not much past the 10 psi mark. Pool looks great; FC a bit high but all other signs nominal.
No trees or yard debris around. When should I clean the cartridges (4)?

 

[duraleigh]

When should I clean the cartridges (4)?

When you observe a 25% increase over your original clean filter.