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