This pack of 3 citric acid sachets by Enagic is compatible with specific Kangen models such as K8 SD501 JR2, JR4 & R. Made of plastic and powder, these sachets are designed for commercial and household use. The filtration method is carbon/charcoal, and each sachet has a capacity of 30 grams. Originating from Japan, these silver sachets are a convenient and effective solution for water purification and maintaining the functionality of your Enagic appliance.