I'm a happy UV tube/distilled user myself. I never have had one of these significant sedimentation types of occurrences when I was using UV dye, but regardless...I just don't find the need anymore with UV tubing. I've read through similar occurrences every now and then on a wide array of different UV dyes. It's not made up...it's obviously a real problem, but it's not consistent at all. I think it's got to be some sort of chemical or heat related reaction. Maybe some chemical coming off the tubing itself, or something.

I'm not sure, I just gave up on UV dye. I used to run hydrx and various Pentosin's etc. They all faded out on me in a few months. I'm now running straight distilled and UV tubing and my loop has been perfectly clean for 8 monts now without changing. I've got a clear view in my flow meters and it's sparkling clean.

I think UV dyes can work, but they do require much more frequent maintenance....too much for me...I'm lazy..