How do you calculate head?

[Rangeball]

By filter PSI I assume you mean what my filter gauge reads? Normal operation is 10 psi. So 3.2 x 10 psi = 32 head?

And right now my filter psi is 14 (lot's of cottonwood lately), so head has increased to 44.8?

Is that right?

Mark, on the bold-

Is that right? And if head has increase, why am I getting less flow at the return?

Thanks