Aqua MedZyme Liquid 32 oz. Permanently reduces ALL strains of deadly ulcer causing Aeromonas, Pseudomonas in your pond by starving them to death There are many more ponds in the US that will maintain a 68 degree or under water temperature for a longer period of time than a 69 degree water temperature or over! Use Aqua MedZyme and save more than 33% costs per year! Formula has been tested extensively in Koi Ponds, Commercial Aquaculture Applications, Private Veterinary laboratories and University Studies Can be stored for two years at room temperature or 3 years if kept refrigerated Safe for filters, plants, pets and wildlife