The Effects of the I-Tera Care Device on the Physical Properties of Different Water Samples

Abstract

Water is one of the most unique and essential substances on Earth. Consumer wellness products that claim to improve water quality through terahertz (THz) technology have surpassed independent scientific verification. This study critically examines the effects of the I-Tera Care device on the physicochemical properties of water and evaluates the scientific plausibility of terahertz–water interaction claims through an integrated experimental and evidence-based approach. A mixed-method design was employed, combining laboratory measurements with a systematic literature review conducted in accordance with PRISMA 2020 guidelines.
Four water types with different ionic compositions, bottled water, mineral water, tap water, and rainwater, were exposed to the I-Tera Care device under controlled conditions. Electrical conductivity (EC), total dissolved solids (TDS), pH, and temperature were all assessed both before and after exposure. The findings revealed measurable but non-uniform differences in EC, TDS, and pH across water types. Bottled, mineral, and tap water all had higher EC and TDS levels, however rainwater had lower levels, as well as a significant increase in pH. Notably, temperature increased consistently across all samples, showing that thermal effects are a substantial confounding factor in interpreting the reported physicochemical changes.
Synthesis of the reviewed literature demonstrates that while THz radiation can transiently modulate hydrogen-bond dynamics and ionic mobility in aqueous systems, such effects are reversible and do not constitute permanent structural modification of water. Taken together, the findings indicate that exposure to the I-Tera Care device induces short-term physicochemical variations that are strongly mediated by water composition and temperature. The results do not provide empirical support for claims of sustained water restructuring or therapeutic benefit. This study underscores the necessity for rigorous thermal control, advanced spectroscopic validation, and biologically relevant outcome measures in future evaluations of THz-based wellness technologies.