Thanks to my reef maintenance hobby, I've had dozens of pumps. Everything from Cobalt's Maxi-Jet to Mag Drives and Shark Pumps. This is one of the worst pumps I have ever had. It is ABSOLUTELY noisy because from across the room you can hear the propeller rumble inside. When it turns on (I use an alternator) it starts with a very unpleasant and loud click that even my inferior Acce pump doesn't have. I tried to transplant and fiddle with the propeller but to no avail, same loud knocking. The only reason I gave this one 2 stars is because it technically "works". I would strongly recommend avoiding this Marineland pump (made in China) and spending the extra $10 on a cobalt version (made in Italy) Better, I regret wasting my $30 as I now deactivated the shaft generator and only operated the Acce pump, which was parallel to this one. Downgrading this rating from 2 stars to 1 star. That little pump in my 28G Nano is MUCH louder than my Mag Drive 12 in my 100 gallons. I've also included a link to a version of Cobalt that I've owned 2 of these with much less noise for almost 2 years.
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