Resin Regenerator™ has been formulated to regenerate our Freshwater Nitrate Remover Pro™. It has a unique formulation making it very effective at regenerating our Freshwater Nitrate Remover Pro™, helping to achieve the 10x regeneration mentioned above. 1L of Resin Regenerator can restore 2L of Freshwater Nitrate Remover Pro™ making it affordable for the consumer and an easy up-sell for retailers. We offer this product in the 1L size only, this helps to reduce shelf space and helps the hobbyist become accustomed to a simple solution.