Wow,
Thanks guys/gal for the world of info on this. Ted, you are correct. The pump purchased is a Gast Rocking piston pump 100 psi/1.5 cfm. Company that sold me this unit.... plus other ads on pump insured that it would be adequate for aerating 1/2ac. pond and would pump air to 20+ ft. Was I misled? Concur with evaluation of others also about temp. concern. Was only considering nighttime usage in midsummer period. Was looking at Vertex Airstations, Would you suggest twin disc or would one disc be enough? Thanks again.... slydog