I have noticed from user results, that this item is best used as soon as you notice a problem, or is "mild" or not very old.
For something way out of control, I can only think it will take this product months to get slight control of the problem.
If you don't have the time to watch/view your tank daily or every other day, I am not sure this is the best hobby for someone. Reef tanks, IMO, take users time to check and make sure things aren't out of control. (ie. weekly testing, daily visual inspection, etc.)
I also understand it can take time to find a solution to your problem, but it is easier to control/eliminate a problem if you see it right away. Just post away on the forums with pictures and descriptions of what you're seeing. Sometimes its good, sometimes its bad. If it's bad, and your pictures/description are decent, there is usually someone who will chime in with a solution.