I've read many of the useful articles here, and it is impressive the amount of knowledge that resides here. Thanks to all the contributors for taking the time to educate us pool owners.
I've had a rash of bad luck with my pool -- my filter housing cracked and my pump died within just 2 months. So ... I have a new Hayward C751 cartridge filter and a new Hayward MaxFlo VS (SP2301VSP) variable speed pump. I was actually happy when my old pump broke because I always wanted a VS pump. The MaxFlo seems to be really good. I've had it in for just 1 week. I'm still researching how long I should run it, and at what speeds. I noticed that the MaxFlo user manual did not have an RPM-to-GPM table, and I was frustrated by that because I was set to "turn my pool over once per day!". But reading some articles here I discovered that (1) RPM to GPM is hard to generalize since every pool is different, and (2) turning my pool over once per day should not be my objective -- it should be to keep my FC/chemistry on target. Since my pool is screened, and I have just about zero debris (skimming is rarely needed), I'm going to run my MaxFlo at around 1500 RPM (170 Watts) for about 4 hrs to start, keep my FC on target and see what happens. I'm tempted to go to even lower RPMs, but I'm still a little skeptical.
On the flow rate, I wanted to be absolutely sure that at my MaxFlow's max RPM of 3000, that I would NOT exceed the "design flow rate" of my filter, which is 75 GPM. I'm not sure what the flow rate of my pump is at 3000 RPM, but I believe (?) it should be below 75 GPM. Perhaps someone could comment on this.