2 October 2026
Water Treatment in Hotels: Which System Goes Where?
From the kitchen to the pool, the laundry to the boiler room, every point in a hotel needs a different water quality. A guide to putting the right system in the right place.
Water in a hotel is used for very different purposes, and each point of use expects a different quality. Trying to meet every need with a single central system leads to both unnecessary investment and the wrong result.
**Boiler room and heating circuit.** For steam boilers and heat exchangers the critical parameter is hardness. A softening system is essential; without it, scale-related efficiency loss and failures are inevitable. Outlet hardness should be 0–1 °F.
**Laundry.** Hard water stops detergent foaming and leaves a grey film on textiles. Softened water cuts detergent consumption by up to 30% and extends the life of the linen.
**Kitchen and drinking water.** Here the target is safety rather than hardness. An activated carbon filter removes chlorine and odour, reverse osmosis separates dissolved solids and heavy metals, and ultraviolet disinfection provides microbiological safety without chemicals. Bars and coffee machines additionally benefit from scale-protection filters.
**Pool.** Pool water requires balance, hardness and disinfection to be managed together. Water that is too soft attacks concrete and grout, so the target here is balanced hardness, not zero hardness.
**Coastal and island properties.** Where mains water is insufficient or brackish, a seawater reverse osmosis system can supply the entire property. In that case the SWRO outlet becomes the main source and the sub-systems above are built on top of it.
The right design is not a separate system at every point, but a shared pre-treatment line with point-of-use units added on top. Engineering starts with the water analysis, establishes the flow and quality requirement at each point of use, and sizes the line accordingly.