It has arrived and while I haven't tried it in anger yet, I have tested it on the kitchen sink. At a high flow it works great, but on very low flow the swirl effect isn't so pronounced. So a small diameter pipe at high pressure would work best. It certainly would not work as a sparge spreader due to the low flow rate required. But as an aid to aeration going into the FV is would be fine. Not perfect by any means, but it works.