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 1 lb size is ideal for home growers, small hydroponic systems, and trial use. NSF/ANSI Standard 60 certified and ANSI/AWWA compliant.

Copper is essential for enzyme activation, photosynthesis, and lignin synthesis. At trace levels it's critical — but easy to over-apply. 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
• 1 lb size — ideal for home growers, small systems, and product trials

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)