Disinfecting the water system doesn't stop legionella from colonizing the shower head itself. Safe Shower seals the outlet the moment water stops, and disinfects the water that's left standing — continuously, not just when the tap is on.
Legionella is a parasitic bacterium that survives disinfectants far better than most microorganisms. Once the shower stops running, residual chlorine dissipates and air re-enters the head — creating exactly the stagnant, low-disinfectant conditions the bacteria needs to establish a biofilm.
RISK
Low-traffic fixtures — guest suites, unused patient rooms, seasonal facilities — give legionella days or weeks of stagnant water to colonize a biofilm, protected from disinfectants.
COST
A concentration above the permitted threshold triggers remediation, re-testing, documentation, and in some cases fixture closures — recurring costs on top of routine monitoring.
EXPOSURE
Legionnaires' disease is contracted by inhaling contaminated water droplets — which is exactly what a shower head produces, aimed directly at the user.
The patent covers a simple mechanical change with a continuous effect: keep the outlet sealed against air whenever water isn't flowing, so the standing water inside can be disinfected the entire time — not just during the seconds it's in transit.
1
A duckbill valve closes the outlet the moment water stops, blocking the air ingress that normally lets residual chlorine evaporate.
2
A UVC-LED unit inside the sealed chamber disinfects the trapped water continuously, targeting the exact volume where legionella would otherwise establish a biofilm.
3
When the valve reopens, water that was never allowed to sit unprotected flows through — instead of water that's been stagnant since the last use.
Point-of-use UV-C disinfection for legionella has been studied directly: published log-reduction thresholds for Legionella pneumophila fall in the range of roughly 0.9–3.1 mJ/cm², a dose small UV-C LEDs are capable of delivering at short range. Safe Shower's mechanical contribution is what makes that dose usable continuously — sealing the chamber so the LED is disinfecting standing water at all times, not only the moment water is in flow.
PATENT
WO2018116291 — Continuous disinfection of a sealed endpoint, applicable to shower heads, faucets, and other outlets.
We're candid with facility buyers: independent third-party log-reduction validation for the production unit is part of what a pilot is for. If your team requires data before specification, that's the right instinct — let's scope a pilot that produces it.
MECHANISM
Duckbill valve seal + in-chamber UVC-LED, active during standby
INSTALLATION
Standard hot/cold water line connection — no retrofit plumbing required
DISINFECTION CYCLE
Continuous while sealed; unit re-engages automatically on every stop-flow
TARGET ORGANISM
Legionella spp, addressed at the shower head rather than the central system
APPLICABLE SETTINGS
Hospitals, long-term care, hotels, resorts, and other high-occupancy water systems
PATENT STATUS
WO2018116291 Approved
Two settings carry the highest exposure — and the highest cost when a test comes back positive.
Protects immunocompromised patients at the fixture most directly aimed at them
Reduces the frequency of positive samples that trigger mandatory remediation
Supports infection-control documentation without adding staff workflow
Covers exactly the low-traffic suites and seasonal rooms where stagnation risk is highest
Reduces routine flushing and the water-heating cost that comes with it
Lowers exposure to guest-safety liability from an avoidable source
Tell us about your facility — fixture count, water system type, and current Legionella testing regime — and we'll scope a pilot installation.