I'm sorry to be a pest with my questions, I apologize if I have too many threads running at the same time on similar topics. Please feel free to shut all but one down and combine them all into one or tell me to get lost....LOL...I'm starting to annoy myself.....
On this curve for 3/4 HP, 1 HP & 1 1/2 HP Optiflo Pumps from Pentair, can someone tell me from where on the curve do you determine the proper Pump GPM for selecting a Sand Filter?
I understand, Head Loss needs to be calculated first (distance, elbows, elevation changes, plumbing size, etc. etc., etc.). But where do you start on the chart? Lets say for example, I'm considering the 1 HP pump (2-speed). Do I start at about 80 GPM (The greatest GPM flow of the 1 HP pump per the chart.) and deduct the head loss from there and use that GPM figure to select a Sand filter or do I select a Sand Filter based on 80 GPM? I'm sure its not that easy, or is it? One poster has said that calculating Head Loss is not a trivial thing, but a complicated endeavor. I do understand that, but I need a place to start...I don't mean to be difficult.
Again, my apologies, I just want to better understand the relationship between Pumps and Filters when I upgrade. The same way you all have taught us all about pool chemistry (for example, the relationship between CYA and Chlorine.). Those basic chemistry concepts are lost on most Pool Builders/Pool Stores/Pool Owners, but not lost on us. I would like that measure of clarity regarding Pump and Filter selection.
Thanks again