PURA Nitrate-Lock Filter Media by Magnavore. **** PRODUCT INFORMATION **** **** PRODUCT MANUAL **** **** PRODUCT REGENERATION MANUAL **** PÛRA NitrateLock rapidly removes and maintains extremely low to non-measurable levels of nitrates in fresh and salt-water aquariums. Long lasting, can be regenerated 100's of times. Drastically reduces number of necessary water changes. Regeneration is accomplished with plain table salt, quick and completely safe. Convenient to implement, comes with a 6" x 12" 300-micron media bag and is available in two sizes: - 500 ml - treats 50 Gal tank for up to 24 months - 1 L - treats 100 Gal tank for up to 24 months