Here is a picture of the bottle I received from Amazon (on the right) next to the last bottle I bought which is $8 more. It's huge. I've been using this for my cichlid and betta aquariums for years. I have never seen such a big bottle, in stores small bottles cost twice as much as I paid for them. I ended up buying 2 and they will last me at least *a year. I have no idea what the people who say it killed their fish are doing with it. This is a dechlorinator that removes heavy metals, not a miracle cure that will get your aquarium up and running again in a day or make your troublesome water crystal clear. The instructions are pretty clear on how much to use - this is the easiest product I've used on my water. I have been using it exclusively for over 10 years and have never had a problem with it harming my fish or making my water cloudy beyond normal levels which happens when sand is kicked up.
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