This is a great product if you have algae in your aquarium and do not have CO2 injection. It provides CO2 for living plants and melts some types of algae, including the nasty blackbeard algae. Keep the smaller bottle if you have one as the 4 liter per ounce bottle is a lot cheaper but doesn't have a gauge. What I did is that since I already threw away my old bottles I got myself a set of measuring spoons and use them for this purpose only.
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