In a blender, combine 6 cups of cold, filtered water, 4 whole lime wedges, and ½ cup of granulated sugar. Blend on high for 30-60 seconds until smooth and vibrant green.

Place a fine mesh strainer over a large bowl and pour in the blended mixture. Allow it to strain for 2-3 minutes to remove the pulp.

Discard the pulp, rinse the blender, and return the strained liquid. Add ¼ cup of sweetened condensed milk and blend again for 30 seconds until frothy.

Fill a tall glass with ice and pour the creamy mixture over it.

Garnish with a slice of lime on the rim and serve immediately.