Tetra - Whisper 20 Air Pump
The new Whisper air pump was redesigned from the ground up for silence and performance. It has many patented features that minimize noise yet allows for a powerful flow of air.
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Put it in a cupboard above the aquarium, closed the door and can barely hear it. Or at least the hum it emanates is not an annoying sound. I attached a flexible bubble wand to it, does well enough to put bubbles where I need them.
Perfect little powerhouse! Absolutely the quietest, and they last forever. Very happy with these.