Used alone at high concentration or formulated with other products Airophos K18 is fully miscible with water. Where other components are used when formulating detergents, the more soluble potassium based products are usually preferred. Polyphosphates are used as sequestrants, dispersants, scale inhibitors and pH modifiers but not as buffers. Airophos K18 is a milky solution that clears on warming or dilutions.