Status indicator

  • Users can easily confirm that the device is functioning properly.

Key indicators

  • >80% of user-testers correctly interpret product status indicators.
  • Safe water container is not contaminated by typical malfunctions (clogged filter element or element is incorrectly inserted).

Notes and exceptions

  • Failure indicators should be obvious and unambiguous.
  • In the absence of failure indicators, the device should prevent untreated water from contaminating the safe water container.
  • Qualitative and quantitative risk assessments (e.g., failure mode and effects analysis, risk priority numbers, and fault tree analysis) can be conducted to understand the likelihood and the impact of misuse.