i dont know about all that fluffed up writing from culligan. i was having a hard time keeping my water clean and clear when i re setup my tank this went on for a month or 2 i really hate using fillter fiber, to me it just traps and holds on to stuff, also some of my levels where a lil high. i ask a local FS what would help and he handed some chemi pure elite, after 3 days of runing this my levels dropped and my water is crystal clear, also my corals seemed happier and where fully opening. i try to minimize any mechanical filtering i can in my tank so the only thing in my fuge is 2 bags of chemi pure elite, to me my tank and its inhabitants seem very happy. anyone is welcome to stop by and take a look