DL , yes the stations with 2 discs can be sized to operate at 1 cfm each but depends on if your pond was sized for additional air. It may have been sized for the current output,This would depend on your lifting requirement. You should have a spec sheet for your pond when the system was sized that will tell you Complete turnovers per day,Air delivery to each station at your given operating pressure, gallons pumped per day and gallons pumped per air station.This information will tell you if you have "air to spare" I find bubble tubing high maintenance as it seems to foul easily after a year of use and should be flushed internally. Also it should lay very flat as if not more air tends to expel via the high spots.I think the cost is also a factor as I find it costly compared to a properly designed conventional system especially with the latest technology in Shallow Water Airstations. If a herbicide is lowering the DO level it is doubtful that any conventional aeration will counter that rapid decline.This is where a product like GreenClean may be worth researching.
