I purchased the DCT-4000 and DCT-6000 on November 20th, 2015, the DCT-6000 was installed on my 125 Oscar tank the day it arrived, about 6th Months after that, Oscar died from an "I'm jumping out of the tank" injury and we switched to salt water. Since then, this pump has been running 90% 24/7 with a 2-3 delivery schedule per day. When we moved (2 years ago) it was in the bucket for a month before I could start the tanks again. His current job is the mixing station for my seawater (last year we downsized the aquariums to prepare for wall mounting), he works 24 hours a day, 7 days a week at 70%, pushing water through a collector to keep water in to circulate my mixing tank. Close the faucet and open one to fill the aquariums after a water change. These pumps are durable and virtually silent. I had a problem with the DCT-4000 bought at the same time, I had to replace the impeller after letting the pump dry without rinsing off the salt water. Not a bad buy, 4 years of intensive use in November. If it ever fails I would always buy another jebao pump.
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