Hygrozyme is an enzyme-based product that breaks down old root mass to promote new growth. Completely free of bacteria, it is manufactured in a unique way. With an unlimited shelf life and bacteria-free, there is no way it will introduce rogue living bacteria into your growing system. Instead, in the process of cleaning up your growing medium without the use of chemicals Hygrozyme eats dead protein and removes any dodgy areas where plant disease might develop! With the growing medium thoroughly purified, your plants are able to enjoy all their nutrients with the benefit of fewer attacks from undesirable invaders. A healthy growing medium fosters healthy growth and you can use Hygrozyme during all growing stages. Four litres of Hygrozyme provides you with ample to use as it is diluted in water for seedlings, cuttings, for plants in the vegetative state and also those in the flowering state.