Chemical improve water quality reduce algae build-up Features & Benefits Highly active with a long life. Fast working, long-lasting, Keeps water crystal clear, Phosphate free, Safe for freshwater and marine aquarium. This activated carbon works faster, better, and longer than the rest. Eliminates foul odors, unsightly discoloration, and harmful organic substances. Heat-activated bituminous coal-based granules are specially sized and far more efficient than coconut, wood, or peat-based carbons.
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