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kschweer is correct, the Cobalts and Marineland Maxijets are two different pumps. We have always used COBALT pumps on the Kalk reactors unless you purchased it used. Make sure to replace with Cobalt brand.I didn't have any problems changing out to the newer MJ600 but the seals are so loose and bad on these pumps that it starts to leak after a month or so especially if you don't keep your output line clean and slight pressure builds up within the reactor.
There's got to be a better power head out there we can use, no?