Seachem Purigen - 100 mL Seachem Purigen - 100 mL is a premium synthetic filtration resin for freshwater and saltwater aquariums, designed to remove organic waste, polish water clarity, and help control nitrogenous buildup before it breaks down further. Seachem Purigen for Aquarium Water Polishing Purigen removes soluble and insoluble organic impurities from aquarium water while having minimal impact on trace elements. By removing nitrogenous organic waste before it fully breaks down, it helps reduce the source material that can contribute to ammonia, nitrite, and nitrate. Synthetic Resin Benefits for Clear Aquarium Water Polishes aquarium water to exceptional clarity. Removes organic waste before it breaks down into nitrogenous compounds. Helps control ammonia, nitrite, and nitrate by removing their organic precursors. Suitable for freshwater and saltwater aquariums. Minimal impact on trace elements compared with broad-spectrum chemical media. Can be regenerated when exhausted. Seachem Purigen Filtration Details Product type: Synthetic organic removal resin Primary use: Water polishing and organic waste control Suitable systems: Freshwater and saltwater aquariums Treatment reference: 100 ml treats up to 400 L (100 US gallons) Exhaustion indicator: Beads darken to brown or black Package size: 100 ml Directions for Seachem Purigen Rinse before use. Use in a fine mesh filter bag of 180 microns or less, such as Seachem The Bag, and place where water flow through the media is maximized. Purigen may be used in a canister filter, media chamber, box filter, or high-flow area of a trickle filter. Replace or regenerate when the beads become dark brown or black. Regenerate only by following Seachem's Purigen regeneration instructions, using regular unscented household bleach and a proper dechlorination soak before reuse. What's Included 1 x Seachem Purigen - 100 ml