All I can say is that I have been using Ocean Pure for about 6 months now. I had a very bad hair algea problem when I started using it. I used Kent previously. I can honestly say that I do not have any hair algea in my tank any more. Other than the salt change, I have started using a calcium reactor and have installed a chiller. I'm not sure which item made the major difference, but I am very sure that I am not going to change a thing. I can't stand hair algea. If it ain't broke, don't fix it. (fingers)
Jay