Gypsum & Calcium Sulfate Fertilizers

Custom Hydro carries a complete range of gypsum and calcium sulfate fertilizers for hydroponics, fertigation, soil amendment, and professional turf applications. Whether you need fully soluble solution grade gypsum for drip systems or fast-release pelletized gypsum for soil incorporation, we stock the right product for your program.

Product Categories

• Solution Grade Gypsum — ACG Valu-Fil 650 and Diamond K Premium 97: finer than 325 mesh, fully soluble, ideal for hydroponics, fertigation, and drip irrigation. OMRI listed options available.
• Fast-Release Pelletized Gypsum — MK Minerals Gypsum Ultra: pelletized calcium sulfate for professional turf and horticulture soil applications
• Enhanced Fast-Release Gypsum — Verde-Cal G with thCa™ organic complexing agent: coarse and fine particle sizes for rapid soil incorporation and enhanced calcium availability

Key Nutrients

• Calcium (Ca): ~22%
• Sulfur (S): ~17%
• Nitrogen-free — ideal where N inputs must be controlled

In Stock & Ready to Ship

Custom Hydro is an authorized U.S. stocking distributor of ACG Valu-Fil, Diamond K, MK Minerals, and Verde-Cal gypsum products — inventory on hand and ships fast.