Bought as a replacement in December 2016. I went to the water change in the tank on 12/23/2017, it didn't help. I was going to order a replacement but decided to take it apart and clean the parts including the impeller. Low and now after reinstalling it was working again. For those who say it stopped working after turning it off to clean the tank or make changes, please clean it first and then check again. I used cotton swabs to really clean the inside of the area where the impeller goes. I had a lot of dirt/slime in it so I learned to disassemble and clean every 3-4 months. I bought my first replacement in June 2015. I ordered a new one in December 2016. I think I wasted my money. I think I just had to clean it.
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