I purchased this medium to help reduce nitrate and nitrite in my aquarium and after a few days (less than a week) I noticed a dramatic improvement. The pebbles are small and porous and the product as a whole is very comfortable to use. The only downside is that you cannot use this product if you have a filter that lets a lot of water through. The label states that the water must flow slowly for the product to be effective. It's a great product for me and I will continue to use it.
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