Just installed a 1/3 hp Thomas pump with 100' of 3/8" air hose connected to 2 - 2' diffuser rings approximately 12' deep. What kind of air pressure should I be seeing om my air gauge? It is reading 8 lbs. is that about right? The guy I purchased the system from suggested it should run around 3 lbs. I have checked and made sure the line doesn't have any kinks or restrictions in it.

Thanks for any info,
LLWC