Bionova Zym Enzymes and Stimulator, 20 LiterHealthier Substrate Enzymes Concentration 1: 2000 NPK 0 0 0 Healthier Substrate Bionova Zym is a natural bio catalyst (process accelerator), medium builder and medium improver based on specific enzymes. Enzymes stimulate the water retaining ability of every medium, which enables a quicker and better penetration of water into the medium. While Bionova Zym penetrates the substrate, it creates more oxygen! What is Bionova Zym? Bionova Zym will increase