I still use a PM Bullet 3 and I think Dez does as well. The optimal pump for it is an Iwaki 70 according to the owners manual which you may still be able to download from PMs website. Thats what I'm using these days however I do find it to be much louder than the Iwaki 55 that I used to own. I don't feel that it improved the performance of the skimmer by much either. To quiet down the air intake you could build a muffler out of tube and PVC plumbing. I draw the air for mine through a tube that runs through the exterior wall of our house. This silences the intake but the real reason I do it is to help boost the pH in the tank.
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