Energy efficient, but not silent By Liz on 8/13/2014
Liz would recommend this product to a friend
There's nothing "silent" about this pump, it emits a loud hum like all the others (though maybe quieter? I'd like to see decibel noise comparison readings on these products that claim to be quieter). I bought it for the energy efficiency/reduce heat in the aquarium. The flow adjust valve is easy to reach/turn. Provides ample flow for a 40 gallon aquarium with a 5' return from the sump.