Best-in-Class Water-Soluble Potassium Sulfate for Fertigation & Hydroponic Use

SoluPotasse® by Tessenderlo Kerley is the original water-soluble grade of sulfate of potash (SOP) — delivering 51.5% potash (K₂O) and 18.7% sulfur (S) in the sulfate form. Produced in Belgium to exacting purity standards, SoluPotasse® dissolves rapidly and completely with no residue, making it the preferred potassium source for drip fertigation, hydroponic nutrient solutions, and foliar programs across a wide range of crops.

Potassium drives fruit sizing, sugar accumulation, water regulation, and stress tolerance. Sulfur in the sulfate form is immediately plant-available and supports protein synthesis and enzyme activation. Together, K and S in SoluPotasse® deliver dual-nutrient value with virtually no chloride and zero nitrates — ideal for chloride-sensitive crops and high-quality produce programs.

Guaranteed Analysis

• Potash (K₂O): 51.5%
• Sulfur (S): 18.7% (sulfate form)
• Chloride: virtually none
• Nitrates: none
• Origin: Belgium

Application Methods

• Drip fertigation: Compatible with drip, micro-sprinkler, sprinkler, flood irrigation, and pivot systems
• Hydroponic: Dissolves completely; suitable for recirculating and run-to-waste systems
• Blending: Compatible with most fertilizers; do not blend with calcium-containing fertilizers

Key Features

• 51.5% K₂O — high-concentration potassium for efficient fertigation dosing
• 18.7% sulfate-S — immediately plant-available; supports protein synthesis and enzyme function
• Dissolves rapidly and completely — no residues; prevents dripper clogging
• Low pH solution — improves availability of phosphorus, iron, and most micronutrients
• Extremely low salt index — safe for sensitive crops and high-frequency fertigation programs
• Virtually chloride-free — ideal for chloride-sensitive crops including strawberries, tomatoes, and specialty crop
• Nitrate-free — suitable for late-season and ripening programs where nitrogen must be minimized
• Improves crop quality — increases resistance to transport and storage damage; boosts stress tolerance
• 55 lb bag — commercial scale for greenhouse and large fertigation programs