I have a 50 gallon tank that has been running continuously for 36 years. The twin-bar gravel pack worked with two Hagen heads from the start until one of them simply failed earlier this year. I wanted to buy another one, but this model is sold out today. The Aquaclear 20 is from the same company so I was hoping for the same performance as the previous model. But that didn't happen. The first one I ordered made noise as soon as I turned it on and I sent it back for replacement. The replacement was quiet until a few days ago. It started making a buzzing/buzzing noise that was unacceptable to me when using it. I ditched the Aquaclear and replaced it with another one I found at Revain. Works very well and is absolutely silent. I'll have to wait and see how long this lasts. This is the one I replaced with Aquaclear. Nevertheless, absolutely silent pumping of a large volume of water. OlimP shop 2 pcs. 158 GPH Powerhead Submersible Aquarium Fish Tank Underground Filter
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