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Parent Compound: HEDP (Hydroxyethylidene Diphosphonic Acid). HEDP itself is a powerful scale and corrosion inhibitor.
Salt Form: HEDP•K2 is the potassium salt of HEDP. This means the acidic protons in HEDP have been partially replaced with potassium ions (K⁺). The "Di" in "Dip potassium" typically indicates that two of the acidic groups have been neutralized.
Key Advantage: Converting HEDP into its potassium salt significantly improves its water solubility and stability in liquid formulations, especially under cold conditions. This makes it much easier to handle and dose compared to the free acid form.