Combine the spinach, romaine and water in a blender and begin processing on low. Gradually move to higher speeds and blend until smooth. Next, add the celery, apple, and pear, and the cilantro and parsley (if using). Lastly, add the banana, lemon juice and ice (if using), and blend until smooth. Serve at once or refrigerate, covered, for up to 2 1/2- 3 days.