And that's 3000 gpm vs. 110 gpm?
Assuming 24h operation for the pump it looks like $73/mo. at $.12/kwh.
Bottom line looks like about 50-60x greater cost per unit of water moved for the pump vs. the compressor.
In a year of continuous operation you might save $500 to use the compressor. In four years it's possible you could have justified a brand-new purpose-built compressor plus lines and diffuser stations.
