This standard describes the use of potassium hydroxide (KOH), dry and liquid, for use in the treatment of potable water, wastewater, and reuse or reclaimed water. It can be referenced in documents for purchasing and receiving potassium hydroxide and can be used as a guide for testing the physical and chemical properties of potassium hydroxide samples. The stipulations for this standard apply when this document has been referenced and then only to potassium hydroxide use in the treatment of potable water, wastewater, and reuse or reclaimed water.