01 - Combine cold water, lemon juice, and maple syrup in a large pitcher. Stir thoroughly until the syrup is completely dissolved.
02 - Whisk blue spirulina powder with 1/2 cup room temperature water in a small bowl until fully dissolved and smooth.
03 - Pour the spirulina mixture into the lemonade base. Stir until the liquid is evenly colored with a vibrant blue hue.
04 - Taste the lemonade and adjust sweetness or lemon juice as desired to achieve the perfect balance.
05 - Add ice cubes, lemon slices, and fresh mint leaves to the pitcher or individual serving glasses. Serve immediately while chilled.