This is 10g x 5 bags of calcium chloride, which can be used as a solidifying powder for Puni Puni Aquarium. I bought this to use at home because I ran out of the solidifying powder, but I have some left over, so I'm selling it. Compared to the set, the granules are uneven, but you can use it in the same way as the included solidifying powder by dissolving one bag in 700cc of water.