01 - Combine cold filtered water, fresh lemon juice, and maple syrup in a large pitcher. Stir vigorously until the sweetener completely dissolves.
02 - Whisk blue spirulina powder with room temperature water in a small bowl until fully incorporated and smooth, ensuring no clumps remain.
03 - Pour the dissolved spirulina mixture into the lemonade base. Stir thoroughly until the liquid achieves uniform vibrant blue color throughout.
04 - Taste the lemonade and modify sweetness or acidity as preferred by adding more syrup or lemon juice.
05 - Fill serving glasses or the pitcher with ice cubes. Add fresh lemon slices and mint leaves. Serve immediately while thoroughly chilled.