As you can see by my siggy, I have a 0.5 hp pump sitting about 6 ft away from the pool. I think it has zero head; at any rate, the top of the sand filter is about level with the outlet for the pool. Maybe 1 to 2 feet higher than the actual pump. What I'm wondering is, how many gallons per minute does my pump push? Is there a chart I can look this up? A calculation?