Seachem Purigen is a premium synthetic adsorbent that revolutionizes aquarium filtration. Unlike other products on the market, Purigen is not a mixture of ion exchangers or adsorbents, but a unique macro-porous synthetic polymer that removes soluble and insoluble impurities from water at an exceptionally high rate and capacity. This high-capacity bio-organic filtration resin effectively controls ammonia, nitrites, and nitrates by removing nitrogenous organic waste that would otherwise release harmful compounds. The impact on your aquarium is impressive clarity and purity of water, unmatched by any other product in its category. Seachem Purigen has a unique ability to change color as it exhausts, turning from its original deep amber to a dark brown, signaling the need for regeneration. Remarkably, it is both regenerable and reusable, offering long-term cost-effectiveness. A simple bleach solution can restore up to 100% of Purigen's original capacity, making it an environmentally friendly choice. Designed for both marine and freshwater use, Purigen is significantly more effective than activated carbon or ion exchange resins. It won't impact your aquarium's pH levels and is safe to use even in the most sensitive of setups. It comes pre-packaged in a fine mesh bag for easy installation and use. In essence, Seachem Purigen offers unparalleled water purification, contributing to the health and longevity of your aquatic life. It's an investment in the beauty and vitality of your aquarium, promising clear, pure water that lets your aquatic world truly shine.