performance curve?

thank you everyone for your help. i thought i understood how to read it but now i'm realizing i dont. for the 3.0hp model i'm trying to figure out at what rpm to run the pump to achieve 20 gpm up to 40 gpm. is there a formula to help determine this? i tried plugging in some ratios based on what i saw in the literature [it said 1-100%(450-3450RPM)] but i wasnt getting consistent answers. I'm trying to figure out how many times my pool is turning over in a day. ideally i'd like 2 in the summer.
 
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