MarinePure is the perfect place for beneficial bacteria to flourish in order to remove harmful fish wastes. It will eliminate ammonia and nitrites and lower nitrates.MarinePure's bio-media is the most technically advanced bio-media available today.Features Thin Bio-Film TechnologyMarinePure is inert and will not harm aquarium inhabitants.  Why Use MarinePure?Better value due to high performanceReduced tank maintenanceAllows for higher fish loadsCan use a smaller filtration footprintMore consistent water chemistryEasy to shapeCan be used in a variety of applications;Used in tankUsed in sumpsUsed in canister filtersUsed in DIY filtersUsed in trickle or shower filtersUsed in waterfall filtersUsed in hang on back filtersThin Bio-Film Technology Combination of vast surface area and open/interconnected pores allow a thin bio-film to develop.This thin film allows bacteria to flourish because necessary nutrients are immediately available.With the open pores, old dead bio-film is easily flushed from the media and will not plug the media.Water flows through the media, not around as with other denser medias, thus utilizing the most surface area for beneficial bacterial growth. MarinePure Technical Info MarinePure is designed to be a substrate for bio-filtration, specifically to target ammonia and nitrite removal (nitrification) and to minimize nitrates (denitrification). MarinePure is suitable for both freshwater and saltwater (marine) environments. MarinePure can be used fully submerged or in trickle/shower filters. It should not be used in moving bed filters.Light Weight Bulk Density = 0.3 - 0.5 g/ccHigh Surface Area 1.3 - 1.7 m2/gOpen Pore Structure 80 - 90% Open PorosityChemically InertHydrophilic Adsorbs water and stays wet longerLow Pressure DropUnaffected by ozone