Welcome Western,
Sizing a pump will depend on the amount of PSI, and CFM needed at the diffuser head. To reach the bottom of your pond (10') through 410' of 1" pipe, you will need to meet 4.64 psi. That does not include the back pressure on diffusers. You may need to add a fudge factor of .5 psi for the diffuser back pressure.
The Gast 1532 has been around ponds most of its life and is tried and true. The maintenance is much higher on the rotary vane compressors than the wobl or rocking piston compressors on the market. Therefore what you may save in the intial cost of the compressor will eventually be spent on vane kits each year or two.
The diffuser needs to be sized to meet the oxygen demands of the brood stock. If you are sticking with a warm water species, you can expect the fish to consume 0.03 lbs of oxygen per hour per 100 lbs of fish. In other words, 100lbs of warmwater fish will consume 3 lbs of oxygen per hour.
These are just some numbers and facts you need to write down when looking at when designing your system so you don't run into problems later on.
Again, welcome to Pond Boss.
