I fitted a spray bar to my Juwel 180 600l, but the flow wasn't great. I think the Juwel pumps are not that powerful especially when the outlet is flow limited by a spray bar.
I tried a 1000l pump head, flow was obviously better, but it kept blowing the home made spray bar off the pump head, as the fittings are push fit rather than push click fit. Also due to increased flow it flattened and crushed the internal filter sponges.
Using my JBL 1500l external filter was significantly better, getting enough slow all around the tank.