From an ethical perspective, smart hydration products can promote healthier lifestyles and more sustainable consumption. By tracking hydration and increasing confidence in tap water quality, users may change their behavior and reduce the purchase of environmentally harmful single-use plastic bottles. Since the product is in frequent contact with the body, safety, reliability, and responsible design are essential. A product must be safe, reliable, and meet legal standards. Addressing these aspects helps create a responsible and sustainable solution.This chapter evaluates ethical considerations from the perspectives of engineering duties, environmental impact, sales and marketing ethics, and product liability.

Engineering ethics refers to the moral responsibilities and professional standards that guide engineers in designing and developing technology. It focuses on protecting public and individual safety, acting honestly and objectively, working within one’s competence, and ensuring fairness and transparency in technical decisions and communication. Ethical engineering also includes resisting misleading marketing, avoiding conflicts of interest, and contributing to sustainable and socially beneficial innovations. Ultimately, engineering ethics ensures that technological progress serves people, society, and the environment in a responsible way.

The following section explains some of the responsibilities and duties of engineers and then applies them to our project. These duties are based, on the one hand, on the course content [1] and, on the other hand, on the German fundamental ethical principles of the engineering profession [2].

The duty to oppose unfair competition means that engineers have the responsibility to act fairly in the market and avoid misleading practices that could harm competitors or deceive customers. This includes making accurate performance claims and respecting intellectual property, such as patents and protected designs. Engineers must avoid copying patented bottle mechanisms for example the sterilization technologies from other brands. Fair competition ensures trust in engineering solutions and protects innovation. We therefore specifically sought out alternative solutions, such as a combination of various features already available on the market. Moreover, engineers and companies must communicate product capabilities realistically and responsibly, without exaggerating benefits. Especially with technologies like UV-C sterilization, it is important to explain that the system reduces microorganisms but does not necessarily remove all contaminants. For example, we cannot guarantee 100 % the destruction of microorganisms. Nor can we guarantee complete drinkability through the bottles, because the bottle does not cover comprehensive drinking water tests. This must be made clear in our communication with customers. Another issue is the recommended daily water intake, which is highly individual and depends on many factors that are not adequately addressed in the app or when setting the daily drinking goal. Transparency with customers must also be established in this regard.

This duty is similar to the duty of of sobriety in advertising. It means that engineers and companies must communicate product capabilities realistically and responsibly, without exaggerating benefits. Advertising should therefore focus on evidence-based advantages, such as improved hygiene or convenience. Clear communication helps users make informed decisions and prevents false expectations that could lead to unsafe usage. Engineers should only take responsibility for tasks that match their technical expertise and time capacity. Developing smart products requires interdisciplinary knowledge, for example in electronics, informatics, design, materials science aswell as in water chemistry and medicine. An engineer designing a smart bottle should therefore collaborate with electrical or biomedical specialists when integrating UV-C systems, filters, or sensor electronics. For the development of TRAQUA, this means that we must increasingly engage with fields not represented within the group, such as medicine and water chemistry. In addition to scientific papers, experts are being consulted on this matter.

Another duty is the duty of non-discrimination. Engineering solutions should be designed to be inclusive, accessible, and beneficial to a wide range of users. This includes considering different physical abilities, ages, and technological familiarity. For example, a smart bottle system could include voice control or audio feedback in the app to support visually impaired users, or simple visual indicators for elderly users. Inclusive design increases product reach and ensures that technological innovation benefits society as a whole rather than only a limited user group.

Across all these duties, user safety must remain the highest priority, especially when integrating technologies such as UV-C light and electronics into consumer products. Engineers must ensure that UV radiation is fully contained within the device so that no direct exposure can harm the user’s skin or eyes. Materials used in contact with water must be food-safe, non-toxic, and resistant to degradation, preventing contamination or health risks. Additionally, the product must be designed to be fully water-resistant and electrically safe, guaranteeing that under no circumstances electrical current can enter the water and injure the user.

Sales and marketing ethics play an important role in ensuring that innovative products are introduced to the market in a responsible, transparent, and user-focused way. Ethical marketing means also considering long-term user value, such as durability, energy efficiency, accessibility, and affordability. One key ethical aspect is product durability. Promoting a long-lasting design helps reduce waste and supports sustainable consumption patterns. In addition, highlighting a reliable battery with sufficient energy capacity ensures that users can depend on the product during daily activities without frequent charging. Offering the product at an affordable price is also ethically relevant, as it enables a wider range of users to benefit from the technology rather than limiting access to a small premium segment.

Inclusivity and accessibility must be integrated into both product communication and distribution strategies. Ethical marketing should emphasize features that support diverse user groups, for example, voice control or audio feedback options that make the product usable for visually impaired individuals. By designing and promoting solutions for a wide range of users, including young and active people who want to stay hydrated independently without constantly buying bottled water, companies can contribute to healthier and more sustainable lifestyles.

From a sales perspective, combining online distribution channels with local retail partnerships increases accessibility and allows customers to experience the product in different ways. Transparent brand communication is essential in this context. Providing trustworthy data about product performance, clearly explaining limitations, and encouraging user awareness helps build long-term credibility. Ethical sales and marketing therefore focus not only on short-term profit but also on creating a transparent brand identity, fostering customer confidence, and supporting responsible consumption through honest and inclusive communication.

Environmental ethics in product development focus on minimizing ecological impact while encouraging more sustainable user behavior. As already mentioned in the section on engineering ethics, durability is an important aspect. Ensuring a battery with sufficient energy capacity and long lifecycle also contributes to sustainability by lowering the frequency of replacements and reducing electronic waste.

Material selection plays an important role. Aluminium as a primary structural material it is highly durable and fully recyclable. In addition, the design should enable easy replacement of wear components, such as filters that require regular exchange. A modular construction allows users to replace individual parts instead of discarding the entire product, further extending product lifespan and reducing waste.

Environmental impact is also reduced through local manufacturing and local marketing strategies, which help minimize transportation distances and associated carbon emissions. By strengthening regional supply chains and distribution channels, companies can lower their overall environmental footprint.

Finally, smart hydration products are contribute to broader behavioral change. By addressing common drawbacks of conventional reusable bottles, such as uncertainty about tap water quality and rapid microbial contamination, they can encourage more people to switch away from single-use plastic bottles. This shift supports waste reduction and promotes more sustainable consumption habits, demonstrating how environmentally responsible design can influence both product performance and long-term user behavior.

To ensure safe use and minimize legal risks, smart water products must follow strict safety, transparency, and regulatory principles throughout design, communication, and operation.

• Fully water resistant design to prevent any contact between electricity and drinking water
• Fail-safe engineering: even if the device is damaged or malfunctions, users must not be harmed
• Compliance with electrical safety standards, compliance with low voltage standards [3]
• Compliance with electromagnetic compatibility (EMC) standards to prevent interference or unsafe operation [4]
• Compliance with low voltage standards [5]

• UV-C light must be fully contained inside the device [6] [7]
• Protection mechanisms must prevent any risk of skin or eye exposure
• Material & Food Safety
• Use of food-safe [8] non-toxic, corrosion-resistant materials
• Long-term material durability and hygiene stability

• Reliable battery with stable energy capacity
• Protection against overheating, leakage, or short circuits
• Safe integration in wet environments
• Avoid overheating the battery components

• Only claims regarding realistic cleaning results or realistic measurement accuracy
• Clear communication of technical limitations
• Step-by-step instructions for safe use and maintenance
• Clear information about filter replacement and cleaning cycles
• Transparent communication to build customer trust

• Secure handling of hydration or usage data
• Encrypted communication and responsible storage
• Transparent privacy policies for users

Based on this ethical and deontological analysis, the team chose to integrate features that improve user safety, promote healthier hydration habits, and reduce environmental impact. Ethical considerations included ensuring safe contact with drinking water, preventing UV-C exposure and electrical risks, using food-safe and durable materials, and encouraging sustainable behavior by reducing dependence on single-use plastic bottles. Additionally, inclusivity and transparency were important factors, aiming to support a wide range of users and provide trustworthy information about product performance.

Consequently, the team decided to design a solution with a user-safe UV-C hygiene support, hydration and volume tracking, modular and replaceable components such as filters, durable recyclable materials, and clear user guidance through digital feedback or app connectivity. These features were added to create a product that is safe, reliable, environmentally responsible, and ethically aligned with long-term user well-being and sustainable consumption.