Review on 💦 Dpofirs 500L/H Water Cooling Pump for PC CPU Liquid Cooling, Acrylic Aluminum Heat Sink Mute for PWM Control 9.6W G1/4 Thread CPU Water Cooling Pump (Black) - Enhanced SEO by Robert Olguin

Well now I know the other manufacturer's pump really was a piece of junk, glad I returned it. The other was REALLY loud, even at the slowest speed. It's fantastically quiet, even at MAX RPM. I hear bubbles gurgling more than the howling of a pump. Another pump also took hours and hours to empty the circuit, this one did it in 15 minutes. Every now and then a few bubbles get into the tank, but I'm guessing 98%+ of the air is missing. It's great after an hour at full speed, which you wouldn't have guessed unless the water level in the tank moved a bit. As soon as I put it back into PWM control mode, it's completely inaudible. It's quieter than in the room. He's worth his money.