Phos-Chek has special properties and has passed third party laboratory testing criteria not matched by any other product. Phos-Chek: Passes and exceeds U.S Government Environmental, Health, Safety and Corrosion standards and requirements by similar agencies around the world; contains no EPA listed hazardous materials; readily biodegrades in the environment and meets all technical requirements of the National Fire Protection Association (NFPA) #1150; extinguishes both a Class A & B fire - passing UL wetting agent tests at 0.25% use rate (the lower this number the more effective the product); is more concentrated (many lower priced products contain much more water, up to 85%); smells like oranges, a proprietary ingredient only available in Phos-Chek
foam.