I have been keeping aquariums for many years and have always been leery of additives of any kind. Several months ago I started a new 90 gallon freshwater tank and have had troubles with cloudy water for most of that time. I am running a 90 gallon sump with 20 gallons of bio media as well as 2 canister filters (for mechanical filtration). Still I was unable to get the tank to clear up.
After researching this product for several days, I decided to pull the trigger and ordered it for my freshwater and my reef tank. I have not yet seen any improvement in my reef tank, but my freshwater system has been transformed. I am now on day 3 of the treatment and the tank had already cleared considerably after only 2 treatments, even though it states that it is good for aquariums up to 55 gallons. I am VERY impressed the effectiveness of this product. The jury is still out on not having to do water changes for a year and I don't plan on putting it to the test.
This product has made a world of difference in my tank and I will definitely but more in the future.