How do you calculate head?

[Rangeball]

Mike, Thanks for the link. I'll give it a look.

If you do not want to purchase a vacuum guage then you can assume that suction head is about 40% of the return head (only works for no solar or extra return features) so

Total head ~ 3.2 * Filter PSI

Thanks for the info.

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?