Works as a backup pump, just right for half the price. Standby pumps don't have to run silently - if I don't have power, the silence doesn't bother me - I need them to run while the power is out. My area doesn't have that many power outages, and when they do, they don't last longer than 15-20 minutes since our power lines are underground. I like the large air stone that comes with it and it creates a lot of air bubbles. I have 2 x 300g, 1 x 75g, 1 x 2 x 125g and 1 x 2 x 30g - and I'm just ordering 3 more for backup to backup. It's just a good feeling when I'm away from home and hearing a thunderstorm coming up and knowing my fish will be fine until I get there. Now I just have to see how long they last - I bought the B11 first until most stopped working for no reason. While I hate when things stop working after the warranty has expired, the half-price stinger isn't that great. Let's see if they hold up to 5 stars.
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