Almost any powerhead will work, as long as you can disassemble it far enough to remove the rotor, and I haven't seen a powerhead where you can't do that. One of the easiest ways to convert the rotor to a quasi-needlewheel type is to slit each rotor down the length either once or twice, leaving two or three narrow flaps instead of one. Then, gently bend those a bit to separate them so the finished rotor has somewhat uniformly spaced narrow flaps all around. I did mine with a toenail clipper, but others have used diagonal cutters. I only slit mine once, doubling the number of flaps, and it worked very well for me. Then you have to introduce the CO2 into the powerhead inlet, so the bubbles go through the rotor and get chopped up. It helped when I added a small airstone so I had smaller CO2 bubbles, rather than just one big bubble each burp of the CO2. It is quieter that way too. I used a small internal power filter instead of a powerhead, so I could use the empty filter chamber to fit the airstone in.