I bought mine new. It came as a bundle when I purchase my complete co2 system (reactor, regulator, solenoid, bubble counter, needle valve, ph monitor). It is powered by an Eheim 2028 and seems to be working like a charm!
Not sure if it is actually suppose to spin, nor does it make a difference in efficiently diffusing the co2 - but mine does!
However i do have to occasionally open to air valve to refill the reactor with water. This could be due to 3 possible things:
- Either the spinning is creating to much turbulance as you say?
- Filter needs to be cleaned and is not providing optimum flow
- or I am feeding too many bps (usually after water change to get things going), which I usually turn down after a while.
At the end of the day all you need to do is calculate you co2 levels. If its way up there, with spinning balls or not, than you are good to go!
JP