My sensor eventually crumbled apart, but I ordered a new one from Coralvue. For my Waterbox, this was the only option. Now that I've had it for a while, I like it. I feel it has helped with better phosphate management compared to when I was using just socks. I should note that because of my config, it sits on the second filter sock space. So I usually have a filter sock before it that I swap out every couple days. Sometimes I put the diverter in place instead of a filter sock. This causes me to consume the fleece much more quickly, of course.