Since the pump is also a cover, you can’t place both a filter cover, and the pump on the pipe to limit what it can take out so that one always pulls water and one always pulls co2. Did you put both pumps on two nonouple pipes that are connected to each other, then filter from there? What keeps both pumps from pulling only water until it is all gone?
Note that it mostly isn’t a problem since the turbine seems to have a good internal capacity and doesn’t have to run long to top off my EV battery bank, then the water clears out and finally the CO2, but I was observing it with a magnifier and thought it was odd.