Potassium Magnesium Sulfate — Water Soluble Sulfur Source

Potassium Magnesium Sulfate (KMS) — Natural Triple-Nutrient Sulfur Source

Potassium magnesium sulfate (KMS), also known as langbeinite, is a naturally mined mineral delivering 22% potassium (K), 11% magnesium (Mg), and 22% sulfur (S) in a single, chloride-free product. As a sulfur source, KMS provides immediately plant-available sulfate sulfur co-delivered with potassium and magnesium — eliminating the need for separate magnesium sulfate (Epsom salt) and potassium inputs in many programs.

OMRI certified for organic production. Available in ultra-fine (UltraFines) and standard mini-granule grades.

KMS as a Sulfur Source

• 22% sulfate sulfur — immediately plant-available; supports protein synthesis and enzyme activation
• Co-delivered with K and Mg — three nutrients in one product; no separate Mg or S inputs needed
• Chloride-free — safe for chloride-sensitive crops and recirculating systems
• OMRI certified organic — approved for certified organic production
• Naturally mined — langbeinite mineral; no synthetic processing

Available Products

• Diamond K KMS UltraFines — ultra-fine particle size for rapid dissolution; ideal for hydroponics and fertigation (1 lb, 4 lb, 17.5 lb, 50 lb)
• Sul-Po-Mag K-Mag Standard Mini-Granule — uniform mini-granule for blending and broadcast application (50 lb)