I'm having problem with my slowly increasing filter pressure. I'm pretty sure it's just algae but it seems rather cyclical. Within 24 hours of hosing off my filters the pressure slowly increases to around 25 psi from 10 psi.

With the lack of flow it seems like more algae grows. 
should I be cleaning out my filter every other day?

backwashing does not seem to remove the green DE material. although it will temporarily decrease the pressure.

thanks