The document presents a comprehensive analysis of low-cost, underutilized water-related cleantech applications across various sectors including environmental cleaning, energy production, and medical uses. It highlights unique techniques that enhance water properties, sustainable processes achieved without chemicals, and the scientific controversies surrounding these technologies, particularly the gap in acceptance between Western and non-Western nations. The document also emphasizes the potential for a paradigm shift in water technology towards more open, limitless systems by 2030.