Household dehumidifier water vs. ISS recycled water
They start from the same condensation principle, but the intended use of the water depends on how many subsequent steps are added.
🏠 Household dehumidifier0 stages of purification
Source of moisture: Humidity in indoor air
↓
Condensation (filter → cooling coil)
↓
Stored directly in a tank · Use: Cleaning, toilet flushing
🛰️ ISS water recycling system4–5 stages of purification
Source of moisture: Exhaled breath, sweat, (US side) urine
↓
Condensation → Filtration → Distillation → Catalytic oxidation
↓
Disinfection (iodine/silver ions) · Use: Drinking water
The scarcity of water determines the number of purification stages—it is the difference between a home on Earth where you just turn on the tap and a station in orbit where not a single drop of water can be newly obtained.