MarinePure Bio Filter Media Gems are specially crafted to target ammonia and nitrite in aquarium systems of up to 75 gallons. Each box contains 90 grams of these highly effective filter media gems, offering a convenient and efficient solution for maintaining water quality. Whether used in canister filters, hang-on back filters, or nano-tank filter systems, MarinePure Bio Filter Media Gems provide versatile filtration support, helping to create a healthier aquatic environment for your marine or freshwater inhabitants.