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Brightwell Aquatics Calcion Liquid Calcium 67.6oz 2L Chemi-Mat is a revolutionary 12' x 12' phosphate filter pad for salt and freshwater aquariums. Simple and easy to use - just drop it into your aquarium, and it starts removing phosphate within 24 hours. After a total of 36-48 hours, simply remove the pad and throw it away. There's no physical breakdown of the pad and no phosphate is released back into the aquarium.