I bought this to see if I could get rid of those blackish algae that were on my plants and greenish black algae on my jewelry. I have no idea how it works, but it worked. I cut off a small piece and put in a HOB filter. It took some time, but eventually all the algae disappeared. I have a ton of these left so it will last a very long time, especially given its low cost. Good value for money!
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