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Effectively eliminates nitrate from your aquarium Our unique technology is crafted to encourage the growth of anaerobic bacteria. These anaerobic bacteria finalize the nitrification process by converting nitrate into nitrogen gas, helping to remove excess nutrients from the aquarium. 2 Blocks can treat up to 1,000L / 264 Gal. Facilitates the nitrogen cycle through denitrification, by fostering anaerobic heterotrophic bacteria (including types from the genera Paracoccus denitrificans and various pseudomonads), which transform nitrate into nitrogen gas. The Nano-Ceramic beads in the Anaerobic-Blocks are specially enhanced with our proprietary technology, allowing them to effectively cultivate anaerobic heterotrophic bacteria that thrive in low-oxygen environments.