I've got one... honestly I'm not really sure it has helped with phosphates. My levels while just running the scrubber were really high, I started running GFO again in conjunction with it and my levels are drastically lower. I have noticed a decrease in nusiance algae in the display since I started running it though. I will tell you that it was not packed well. When I received my from BRS, one of the mounting points for the lights had snapped in shipping resulting in a detached light and a fairly substantial leak in the scrubber. I had some acrylic cement so I was able to fix it... I was able to get them to refund me 15% to make it the price of a scratch and dent item.