Lets look at the similarities of a car and a blast system for a moment. A car has a gas tank, fuel line, injector/carburetor , and an engine. All have to be sized properly to make the car go. A small fuel line would starve a large engine. Too much fuel would flood an engine. Either way your car does not get you anywhere.
The same is true with in blasting. The air supply/compressor (gas tank) has to feed the air line (gas line). The blast pot (injector) feeds the nozzle (the engine) where the work happens. In order to get your blaster running efficiently, use the chart above. If you need more help, contact TMF !