01 - Combine cold water, lemon juice, and maple syrup in a large pitcher. Stir thoroughly until syrup completely dissolves.
02 - Whisk blue spirulina powder with 1/2 cup room temperature water in a small bowl until fully dissolved and smooth.
03 - Pour spirulina mixture into lemonade base. Stir until evenly distributed and vibrant blue color appears throughout.
04 - Taste and modify sweetness or lemon acidity according to preference.
05 - Place ice cubes, lemon slices, and fresh mint leaves into pitcher or individual serving glasses.
06 - Serve immediately while thoroughly chilled.