01 - Combine quartered limes with 2 cups cold water in blender. Pulse 5-7 times briefly—avoid over-blending to prevent bitter compounds from lime peel releasing into drink.
02 - Pour blended mixture through fine-mesh sieve into large pitcher. Press solids firmly with spoon to extract maximum liquid. Discard remaining lime pulp and rind pieces.
03 - Add remaining 2 cups cold water, sweetened condensed milk, and granulated sugar to pitcher. Stir vigorously until sugar crystals dissolve completely.
04 - Taste test beverage and add additional sugar if preferred sweetness level not achieved. Stir thoroughly to incorporate any adjustments.
05 - Pour over ice cubes in tall glasses. Garnish rim with fresh lime wheel slices. Consume promptly to maintain optimal flavor profile.