FAQ
TL;DR: Even 2–3 drops per 2.5 L can leave residues; “Moisture + salt — corrosion, also for electronics.” Power down, clean, ventilate, and stop using saline humidifiers to avoid shorts and long‑term damage. [Elektroda, Vinnic, post #17244653]
Why it matters: For homeowners who accidentally ran a saline humidifier, this FAQ explains risks and fast fixes for PCs, TVs, outlets, and walls.
Quick Facts
- Keep indoor RH at 30–50% (never above 60%) to limit corrosion and mold. [EPA, 2021]
- Typical electronics cleanliness spec: 1.56 µg/cm² NaCl‑equivalent (ROSE test) on assembled PCBs. [IPC, 2017]
- Use only distilled/demineralized water in humidifiers; do not add salt or other additives; avoid “white dust.” [CDC, 2022]
- Residential ventilation baseline: approx. 0.35 ACH or 7.5 cfm/person to dilute indoor aerosols. [ASHRAE, 2016]
- Even turned‑off, passively cooled devices collect deposits; only tightly sealed industrial units resist. [Elektroda, evil_core, post #20822483]
Is it safe to use salt in a home humidifier around electronics?
No. Salt‑laden mist is conductive and promotes corrosion. “Moist, salty fog can definitely damage electronics.” Remove electronics from the humidified room. This includes TVs and computers. Keep the humidifier away from devices and wiring. [Elektroda, andseg, post #17244666]
Do devices absorb salt even when turned off?
Yes. Salt aerosols settle on open vents and chassis even when devices are off. Active cooling only speeds deposition. Passively cooled gear still accumulates residue. High‑end TVs may use fans, but most are passive. Industrial sealed computers resist this; home devices do not. [Elektroda, evil_core, post #20822483]
What should I do immediately after a salty humidifier event?
Prioritize safety around mains. Walls, sockets, and switches can be salt‑coated and hazardous. How‑To:
- Stop the humidifier and air out the space.
- Avoid using outlets and switches until fully dry and cleaned.
- Wipe visible salt from walls, faceplates, and furniture. [Elektroda, Radiokiller, post #17244675]
How do I clean a salty film from a PC or laptop safely?
Seek professional cleaning. Service shops can wash assemblies in an ultrasonic bath. That reaches under components and removes conductive residue. Home disassembly and wiping often miss deposits. Powering on with remaining brine risks shorts and corrosion. “There is a possibility of washing them… but you need an ultrasonic bath.” [Elektroda, Radiokiller, post #17244665]
What humidity level should I keep to limit corrosion?
Maintain indoor relative humidity at 30–50%, and never above 60%. Lower humidity before powering sensitive gear. This reduces corrosion and mold risk after exposure. [EPA, 2021]
Why did salt settle everywhere—was ventilation the issue?
Likely yes. Poor ventilation traps moisture and aerosols. Tight windows and sealed ventilation grilles worsen the effect. Check and restore ventilation paths. Improve air exchange to clear residue faster. [Elektroda, jack63, post #17244684]
If everything works now, can damage still appear later?
Yes. Damage can be deferred. Residue can sit harmlessly while dry. When humidity rises, corrosion and leakage start. Devices with fans, like PCs or laptops, collect more salt and fail sooner. “The effect can be ‘deferred’ in time.” [Elektroda, Tommy82, post #17245039]
Are wall sockets and light switches hazardous after salt exposure?
Yes. Salt on sockets and switches increases shock and short‑circuit risk. Treat this as a priority. Do not use suspect outlets until inspected and cleaned. Address these before dealing with other items. [Elektroda, Radiokiller, post #17244675]
My TV was off at night—did it avoid salt?
No. Being off does not prevent deposition. Passive cooling and open chassis still collect salt. Active airflow would have made it worse, but off is not safe. Only tightly sealed industrial designs resist deposition. [Elektroda, evil_core, post #20822483]
Should I move electronics out of the humidified room?
Yes. Relocate TVs, computers, and other electronics away from the room with saline mist. “I advise you from the room where the humidifier works, remove the TV, etc.” [Elektroda, andseg, post #17244666]
How can I reduce 'white dust' from humidifiers near electronics?
Use only distilled or demineralized water. Do not add salt, iodine, or other additives. Clean the humidifier regularly per its manual. Ultrasonic units can disperse mineral “white dust.” Using pure water minimizes deposits. [CDC, 2022]
What counts as 'clean' ionic residue on electronics?
Manufacturing often uses a 1.56 µg/cm² sodium‑chloride equivalent limit (ROSE test) for assembled boards. This gives context for how sensitive electronics are to ionic contamination. [IPC, 2017]