Hotel Water Treatment

Legionella control in a hotel rests on a risk assessment and a written scheme: keeping hot water hot (stored at 60°C, distributed above 50°C), cold water cold, turnover regular, and outlets flushed — with monitoring to prove it. Responsibility sits with whoever controls the premises: legally the duty holder, in practice the general or facilities manager and a named responsible person. Scale and biofilm are what make the regime struggle — rough scale gives biofilm a home, and biofilm shelters bacteria from temperature and chlorine. At Grand Hotel Terme di Comano, where Legionella repeatedly returned after sanitisation, certified testing found below 10 CFU/L in every sample after HydroFLOW® was installed as part of a programme that also included thermal shock and purging — with results still within limits seven months on.

UK guidance sets no fixed interval. ACOP L8 requires the assessment to be reviewed regularly and specifically whenever there is reason to think it is no longer valid — a change to the water system, its use, key staff, or after a positive sample or a case. The often-quoted “every two years” is a habit, not a rule. What matters to the assessor is that the scheme’s controls demonstrably work; a system that stays clean of scale and biofilm makes that evidence easier to produce, because results hold between visits instead of drifting back.

It is the most expensive place scale can sit. Around 1 mm of scale can cut heat transfer by about 7%, paid in fuel on every litre heated — and US survey data puts water heating at roughly a fifth of a lodging building’s energy use. The maintenance cost compounds it: Redwood Inn & Suites in Alberta was spending a full maintenance day every six weeks cleaning two hot-water tanks, and a French holiday-home residence was replacing five electric heaters a year under 5 cm of scale. Treated, the Alberta tanks ran six months with no cleaning and 94% less scale accumulation; the French heaters stayed operational, saving an estimated €1,750 a year.

There are three usual routes. Mechanical cleaning and acid descaling remove deposits after they have formed — at the cost of downtime, acid handling and metal loss, and the scale returns because nothing has changed in the water. Softening prevents scale downstream but removes nothing already there. HydroFLOW® works differently: with new deposits no longer forming, the water regains capacity to dissolve minerals and draws existing scale back into solution gradually, layer by layer, while the system stays in service. At the French residence the remaining scale “crumbled like sugar”; in Alberta, drains that had needed pressure-jetting flowed freely. Expect loosened material at strainers and fixtures in the first weeks — that is the system clearing.

In a hard-water hotel the usual culprits are scale-blocked strainers, showerheads and aerators, and scaled heat exchangers that cannot keep up at peak demand — the rooms furthest from the plant suffer first. A 136-room San Antonio hotel reached the point of weekly low-flow alarms, guest refunds and room discounts; its water measured 21 grains per gallon. After two HydroFLOW® i100 units were installed on the mains feeding its tankless heaters, flow improved within a month, the alarms became rare, and previously clogged showerheads and aerators showed minimal debris.

Hard water minerals dry onto glassware as spots and film, and the same minerals coat the dishwasher’s own elements and internals, so the machine washes worse as it scales. A Waikiki hotel recorded a noticeable reduction in dishwasher limescale within 60 days of fitting a HydroFLOW® S38, with significantly fewer water spots on dishes and glassware; a five-star Hong Kong hotel saw visible scale reduction on a dishwasher heater that had been cutting the machine out. Rinse chemistry stays as it is — it simply stops fighting the deposit.

No. HydroFLOW® is not a disinfectant and does not sanitise water — your risk assessment, temperature regime, flushing routine, sampling programme and written scheme stay exactly where they are. What changes is how hard they have to work: when scale and biofilm are disrupted, temperature and chlorine reach the bacteria they are aimed at. The case studies on this page show monitoring results improving while the control scheme stays in place — never the scheme being removed.

No to both. HydroFLOW® is not a filter and does not remove sediment or suspended solids — any filtration stays in place, and in the first weeks you should expect more material at strainers, not less, as existing scale releases. And nothing enters the water: the unit induces its signal through the pipe wall without contacting the flow, so composition, hardness reading and taste are unchanged — no salt, no residue, nothing for guests to notice. If your primary problem is supply quality or sediment rather than scale and biofilm, filtration and supply treatment are the answer and we will tell you so.

Yes. The unit installs around the outside of the existing pipe — no cutting, no drain-down, no interruption to hot water — typically in under an hour, with the hotel operating throughout. That also makes trials straightforward: a unit on one system, measured against your own maintenance logs and sampling results, is how most of the sites on this page started. A Macau casino hotel began with a trial in 2021 and now runs eleven units across 1,500 rooms.

It depends what you measure. Flow and fixtures respond first — San Antonio’s flow rates began improving within a month. Cleaning intervals stretch over months: Alberta’s tanks ran six months without cleaning where six weeks had been the rule, and Half Moon Resort’s heater cores needed no removal for over eight months. Existing scale releases gradually — the Waikiki dishwasher showed a noticeable reduction at 60 days — and water-safety evidence builds through your own sampling programme, as Comano’s seven months of compliant results show. Low-usage periods do not pause it: the signal keeps working on standing water overnight and through seasonal closure.