99.9% Pure Boric Acid Powder for Hydroponic, Fertigation & Foliar Use

Optibor TP Boric Acid Powder delivers 17.5% boron (B) in a 99.9% pure, technical-grade orthoboric acid (H₃BO₃) — sold in a resealable screw-top jar. The 4 lb size is ideal for small commercial operations, greenhouse growers, and multi-system nutrient programs. Boric acid is one of the most soluble and readily available forms of boron for plant nutrition.

Boron is essential for cell wall integrity, pollen tube germination, sugar transport, and calcium uptake. Deficiency is common in sandy, leached, or high-pH soils and shows up quickly in new growth. Boric acid dissolves cleanly in water with no residue, making it easy to prepare precise stock solutions for hydroponic and fertigation programs.

Guaranteed Analysis

• Boron (B): 17.5%
• Formula: H₃BO₃ — Orthoboric Acid
• Purity: 99.9% min
• Target range in nutrient solution: 0.1–0.5 ppm B

Application Rates

• Hydroponic stock concentrate: Dissolve 0.3 g per liter of pure water; apply at 5 mL/liter (19 mL/gallon) to achieve approximately 0.25 ppm B in working solution
• Fertigation & foliar: Apply per label recommendations; consult a certified crop advisor or agronomist for crop-specific rates

Key Features

• 99.9% pure boric acid — technical grade; consistent, reliable boron delivery
• 17.5% boron — highly soluble orthoboric acid form; dissolves completely with no residue
• Versatile — suitable for fertigation, foliar spray, and hydroponic nutrient solutions
• Resealable screw-top jar — keeps contents dry; easy to measure and store
• 4 lb size — ideal for small commercial growers and multi-system operations

Use in accordance with recommendations of a qualified individual or institution. See SDS for safety handling information.