Freshwater Nitrate Remover Pro™ is a human-grade, nitrate-removing resin which is suitable for freshwater aquariums only due to the high sulphate concentrations present in saltwater which hinder the removal of nitrate. This high-quality resin comes in 3 sizes: 1L, 2L & 5L. All sizes include a reusable non-metallic zipper-locked media bag and a measuring cup to make using the product incredibly easy to use. 1L can treat up to 50,000L of aquarium water @ 1ppm Nitrate making it highly effective and affordable. On top of this, each bucket contains a table on the label where the consumer can note how many times it has been regenerated with a maximum of 10x before the resin shows signs of decreased efficacy.