Coco coir is an organic product derived from processing coconut husks from coconut trees grown in tropical and subtropical areas. The processing of coco husks to obtain coco coir involves a series of steps including aging, washing, rinsing, buffering, drying, grinding, grading, and compressing. These steps are necessary to change the physical and chemical characteristics of coco coir so that it is suitable for plant growing. Prior to any treatment, coco coir’s cation exchange complex is naturally saturated with sodium due to coconut trees natural proximity to coastal areas and high tolerance for salt (sodium chloride). Coco coir’s initial salt content, measured by the electrical conductivity (EC), can range between 2 and 6 mS/cm - excessive for plant growing. Coco coir’s cation exchange complex also naturally contains large amounts of potassium, which competes with magnesium and calcium for uptake. Char Coir coco is abundantly washed with fresh water until reaching an EC below 1.0mS/cm (based on 1:1.5 extraction method). Even after washing, coco coir still contains residual sodium and potassium left in the complex, which can lead to nutrient lock up later. To stabilize the cation exchange complex and avoid nutrient deficiencies during the crop season, adequate buffering of coco coir is essential.