Combine Pectinex Ultra and grapefruit juice to clarify. Then spin the juice in a centrifuge to separate the solids.
Combine clarified grapefruit juice, gin, water, simple syrup, and saline solution. Carbonate the cocktail with carbon dioxide.
Store the complete mixture before or after carbonating in a drawer freezer to keep the cocktail as cold as possible without actually freezing it. This will allow for the best results when carbonating the drink.