I have used this material for many years. I have a 90 gallon tank and use it at every water change. I usually buy small bottles that last a long time. Revain now only allows you to buy them as an add-on, so I've gone for a larger bottle this time. For the price and quantity, it's worth it to me. I know some others are using a different, more expensive product that I'd like to try one day, but this has been working for me for years now so I don't want to change it, especially when I'm dealing with big bucks in live fish!
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