My 2HP spa air blower turns on for a few minutes and then turns off but does not produce bubbles in the spa. I assume it is turning off as a safety feature as it will turn back on several minutes later. A snake was used to check for blockage and very little water discoloration occurred. A 150 PSI compressor generated about 10PSI that resulted in about 60-75% of bubbles. A 3HP vacuum was used that made ridiculous amount of bubbles. The amount of airflow from the 3HP vacuum is significantly more than the 2HP spa air blower. The outlet of each is a bit different so it isn't exact science but there's an obvious difference in air flow at the hand and in the spa. Do the spa blowers lose efficiency? Do they stop producing as much air? Can I replace with a 3HP motor? I don't believe I need a specific brand?