Activated carbon. No frills packaging. The mesh pocket was a pleasant surprise. I'm not sure what others are saying about a cloudy aquarium. You don't have to rinse it properly or grind it while rinsing. The most important point is that carbon has limited life in the reef. 4-5 days max. 1/2 cup per 50 liters. Whether through the reactor or passively. Rinse well, without rubbing, for no more than 10-15 seconds.
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