Protassium+ SOP 3IX 0-0-53 Potassium Sulfate

Protassium+ SOP 3IX 0-0-53 — Highest-Purity Crystalline Potassium Sulfate

Protassium+ SOP 3IX is the highest-purity crystalline sulfate of potash available commercially, produced via ion exchange to deliver 53% soluble potash (K₂O) and 18% sulfate sulfur. With the lowest chloride content and lowest salt index of any SOP on the market, 3IX is the preferred potassium sulfate for high-value crop production, sensitive hydroponic systems, and precision liquid blend formulation.

The ultra-fine crystalline form (very low SGN) ensures rapid, complete dissolution with no residue — making 3IX the ideal potassium and sulfur source for fertigation injection systems, recirculating hydroponic programs, and custom liquid fertilizer blending.

Why 3IX Over Standard SOP

  • 53% K₂O — highest potassium content of any SOP formulation (vs. 50% standard SOP)
  • 18% sulfate sulfur — immediately plant-available sulfur co-delivered with potassium
  • Ion exchange production — ultra-low chloride; lowest salt index of any SOP
  • Crystalline form — very low SGN for rapid, complete dissolution
  • Lowest salt index — safest SOP for sensitive crops and high-EC environments
  • Liquid blend compatible — dissolves cleanly with no residue

Applications

  • Hydroponic and soilless nutrient programs
  • Fertigation and drip irrigation systems
  • High-value chloride-sensitive crop production
  • Precision liquid fertilizer blend formulation
  • specialty crop production — bloom and finishing stages
  • Berries, potatoes, tobacco, and tree fruits

Specifications

  • Analysis: 0-0-53 + 18% S
  • Soluble Potash (K₂O): 53% minimum
  • Sulfur (S): 18% sulfate
  • Form: Crystalline (very low SGN)
  • Production method: Ion exchange
  • Brand: Protassium+ SOP 3IX (historically marketed by Compass Minerals)
  • Country of Origin: Canada

SOP 3IX Technical Documents

These documents describe manufacturer SOP 3IX material. Package weights shown in manufacturer documents may differ from Custom Hydro repack sizes. The historical CDFA record displays “Data/Revisions Required” and does not establish current registration status.

SOP 3IX Ownership and Analysis

The SOP 3IX product business has transferred from Compass Minerals to Saskatchewan Mining and Minerals, according to Custom Hydro’s supplier information. Older Compass Minerals documents linked here are historical references.

A certificate of analysis dated July 22, 2026, for SOP 3IX material supplied to Custom Hydro reports 99.47% potassium sulfate, 53.84% potassium oxide equivalent (K₂O), 44.68% elemental potassium, 18.38% sulfur, 0.02% chloride, and 0.02% insoluble content. These are results for the sampled material, not guaranteed values for every shipment. The fertilizer analysis remains 0-0-53 plus 18% sulfur.

Download SOP 3IX Certificate of Analysis — July 22, 2026 (PDF)

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