John,
I’ve been emptying and changing nets weekly for about six weeks now. Our population usually tapers off as you said, but with all the rain this spring they’re continuing to multiply!
Our greatest problem locally is with the asian tiger mosquito so I don’t even use the octynol and get better results relying on the CO2 from the propane. I’ve also had problems this year with resetting the propane valve, but the purge tool was included when I bought mine.
The machines require some effort in determining proper placement in order to be effective. I agree with you that the maintenance is reasonable for the results. I really don’t understand what Garchib is referring to about the CO2 cartridge replacement… I’ve never needed to use one with my machine but I do have the little adapter if one is ever required. I’ve just used compressed air to blow mine out occasionally.