Top positive review
Good result of my research of about 5 pumps
5 January 2018
I have tried almost 5 Air Pumps, 1 failed in 2 months and other 4 I have returned due to Noise levels at night.
I ordered this SOBO pump after lot of research and with a doubt, but to my surprise, this works like wonder. It have 4 nozzles so I have used connectors and made into 1 single outlets and gives a brilliant Air curtain in my aquarium.
NOISE Levels - It has a a auto controller and upto middle level there is NO SOUND at all. But yes at higher levels it does give humming sound.
SIZE - the piece is BIGGG, i was surprised to see the size of this Pump (almost 8 inches X 6 Inches) which is about 4 times your normal air pump. But as this goes in the cabinet below my aquarium, I am not bothered about the size.
best part is its powerful and does not make the usual irritating humming noise.