The bio-toilet includes four keywords: "environment," "care," "recycling," and "disaster prevention." All of these are very important for the future. Bio-toilets do not require sewage treatment, eliminating the need for the enormous costs currently associated with sewage processing. Our company has also commercialized odorless, furniture-style toilets for indoor use in caregiving. Bio-toilets make it possible to protect water resources, reduce caregiving burdens, and prevent environmental pollution. While the 20th century was marked by flush toilets as a barometer of civilization, the 21st century is the era of bio-toilets.