I am sure that the impeller is a Hammer head . For one when I purchased these pumps the hybrids wasn’t a things and , two it’s writttn on both pumps HH in black sharpie. And third Ike I said earlier that since I was not using this in my old 300 I had to use a ball valve to reduce the flow . The noise ended up being my fault . The way I had it positioned in the sump. The pvc coming of the front was hitting the glass baffle . I moved the pump alittle bit and the noise went away . So now all you can hear is the water coming into the sump
From the 2 inch drain line . I haven’t gotten the kilowatt meter yet it’s supposed to be here on the 29th