HYGROZYME Horticultural Enzymantic Formula. 4 Liter Hygrozyme prevents the formation of pythium and algae in any growing media. Bacteria-free enzymes break down proteins allowing plants better access to nutrients released in the process. All-natural Hygrozyme is 100% effective guaranteed with an unlimited shelf life. It is the ONLY Enzyme product in North America. Please note the manufacturer sets the price we authorized retailers can sell their items. Please note we match and beat prices including total with shipping.