Fine Crystal Copper Sulfate for Hydroponic, Fertigation & Foliar Use

ChemOne Copper Sulfate Fine Crystals deliver 25% copper (Cu) in a 99% pure, feed-grade copper sulfate pentahydrate — sold in a resealable wide-mouth plastic container. The 4 lb size is ideal for small commercial operations, greenhouse growers, and multi-system nutrient programs. NSF/ANSI Standard 60 certified and ANSI/AWWA compliant.

Copper is essential for enzyme activation, photosynthesis, and lignin synthesis. This fine crystal format dissolves quickly and precisely, making it easy to dial in the 0.01–0.1 ppm Cu target range in nutrient solutions.

Guaranteed Analysis

• Copper (Cu): 25.0% (as metallic, not less than 25%)
• Derived from: Copper Sulfate Pentahydrate (CuSO₄·5H₂O) — 99.0% min
• CAS #: 7758-99-8
• Other ingredients: Anti-caking agent (MgCaCO₃) 1.0%

Application Rates

• Hydroponic stock solution: Dissolve 0.15 g per liter of water; apply at 1–10 mL/gallon to achieve 0.01–0.1 ppm Cu in working solution
• Foliar & fertigation: Apply per label recommendations; use in accordance with guidance from a qualified individual or institution

Key Features

• 25% copper — high-purity fine crystals; 99.56% typical purity
• NSF/ANSI 60 certified — meets ANSI/AWWA standards
• Feed grade — suitable for animal feed trace mineral supplementation per good manufacturing practices
• Fast dissolving — fine crystal particle size (80% min passes mesh 60)
• Resealable wide-mouth container — easy to measure and store
• 4 lb size — ideal for small commercial growers and multi-system operations

State restrictions: Not available for shipment to Oregon. See label for WI, CA, and WA recommendations.

Use in accordance with recommendations of a qualified individual or institution. Product Label (PDF) | Safety Data Sheet (PDF)