Extracted from ADA Tourmaline BC product sheet:
"Tourmaline, is called "electrical stone" develops weak electrical current and works for keeping active water. The cell of living becomes active with the active water so that the propagation of microorganism and the growth of plan are nurtured. Also, Tourmaline contains abundant mineral such as Iron, Manganese and Boron etc, and this minute amount of mineral works for promoting growth of plants and healthy condition of fish. Tourmaline BC is made from finely crushed quality tourmaline for increasing its electrical force and poromeric charcoal powder. It prevents propagation of putrefactive bacterium, and maintains substrate condition healthy for a long time by spreading at bottom of the aquarium tank. Also, it has character that promotes absorbing nutrients from their roots, therefore water plants can grow well".
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