Bests & Worsts Reviews from Amazon

So, I was not happy with this at first. Did a LOT of googling and YouTube searching. I now have a nice quite pump, and the fix was actually pretty easy. I don't have a video of how loud it was at first, as the noise came and went, but I have included a final video. What I did should only take about 10 minutes a screwdriver, and some PTFE Thread Tape. 1. Tighten all screws (NOTE: it seemed to me all the holes in the aluminum casting where a bit sloppy, so I loaded each external screw with Teflon Tape, and reinstalled them). 2. Add Teflon Tape to the Brass nozzle barb (that also felt loose to me). 3. Remove the Rear Air Filter, and the 4 screws holding the Piston in place (See Picture). 4. Wrap some Teflon Tape around the ball bearing installed. It seemed to me this was where the rattle was coming from. I think the bearing is a little small, or there is more slope in the holes than needed. This cause a slight harmonic rattle. 5. Wrap tape (optional) on the screws holding both the rear plate and the air filter housing, and reinstall. 6. Run your pump and see if the rattle goes away. A couple notes, most people seem to pinch off their air supplies to only provide the air they need, but this pump isn't a pressure control pump, so it's going to run, regardless of how much air can flow. The better method is to bleed off the excess air you don't need. Take one of your 6 ports (or any other place you want install a bleed valve) and use that valve to bleed off the excess air. My method: 1. Connect all airlines and components you want. 2. Open any flow controls 100% 3. Open your bleed valve (either one of the 6 provided, or someone other valve) 100% 4. Turn on the Pjmp 5. Start to pinch off the Bleed Valve slowly until you get the air flow out of your connected devices. 6. Adjust any local flow valves as needed to balance out air between various components (i.e. Air Stones, Sponge Filters, etc.). 7. If needed close the bleed valve as required. There should be some air coming out the bleed valve, unless all your devices need 100% of the supplied air. 8. NOTE: If you have more air then you need, take your bleed air, and redirect it back at the pump, and use that excess air to help cool the pump. This will do two (2) things, keep your pump a little, cooler and reduce the load on the pump. If this helps, I would be curious to hear the results. I might make a Youtube Video, if I do, I'll come back end update this review. In the video, I try to contrast the air bubbles to the air pump, so give the pump noise a frame of reference.