What Is the Pink Fire Retardant Dropped on Los Angeles Wildfires?

Everything You Need to Know About Phos-Chek

What Is Phos-Chek?
Phos-Chek is a chemical fire suppressant made from ammonium phosphate, similar to fertilizers. It’s mixed with water for application and colored pink to help firefighters track where it has been deployed.

How Does It Work?

• Flame-Proofing Plants: The phosphate alters the combustion process, making plants non-flammable.
• Oxygen Deprivation: Dropped on flames, it helps starve oxygen and slows burn rates.
• Wide Reach: It’s ideal for protecting vast, hard-to-reach areas ahead of advancing fires.

Safety Concerns:
Phos-Chek is generally safe for humans but raises concerns for wildlife and water ecosystems.

• Restrictions: Use is banned near waterways and endangered species habitats unless public safety is at risk.
• Environmental Risks: Studies suggest it may contribute to heavy metal levels in waterways, but Perimeter Solutions insists the product meets all safety standards.

Cleanup:

• The bright pink color fades in sunlight and washes away with weather or cleaning. It leaves no long-term residue.