Bought this Ocean Free, Zero Noise, Air pump today. As the box suggested, the noise is indeed Zero. I also tie it to a sponge as an added cushion to keep it steady on top of the tank.
The purpose of this airpump is to create added water circulation in area my Eheim couldn't reach, thus prevent formation of any algae in stagnant corner. It also helps to stir water surface to break protein film from building up and create more oxygen for my fauna at night.
Less than SGD10, this petite and quiet airpump is very suitable for people with fish tank in their bedroom too. Most importantly, it has an added bubble control tuner which is attached to the pump (see the blue cap on 2nd photo).
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