Worked fine in the beginning...

I purchased two of these - each pump was connected to two air stones. Initially, everything worked well (yes, the pumps were loud but I didn't expect them to be silent), all four air stones were creating a nice wall of bubbles. After a few months, one stone wasn't producing any bubbles. Air was blowing out of both outputs in the filter, but apparently not enough to produce bubbles anymore. I cleaned the stone to rule out the stone itself, but once I swapped the lines on the outputs, the 'dead" stone worked fine and the one that was working now wasn't. Fast forward a few more months, the exact same thing happened to the other pump. So I have 2 air pumps now powering 2 of the original 4 air stones. Frustrating that the same thing happened to both pumps. I wouldn't buy these again...

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