A whirlpool, or SPA if we prefer, is one of the most relaxing, pleasurable experiences anyone could wish for. So we can imagine the heights of bliss if this interval of luxury is enjoyed, not between four tiled walls, but on the deck of a ship, looking out over the boundless sea. The designers of the latest cruise liners have appreciated the full popularity of this form of comfortable relaxation, and have multiplied the number of whirlpools on board; some vessels even have more than ten of them. But like a swimming-pool, a whirlpool requires effective water treatment. In fact, health and hygiene precautions have to be multiplied due to the combination of several risk factors: the water temperature, which increases the risk of the spread of fungi and bacteria, the considerable density of users in relation to the small amount of water in

the pool, and the turbulence generated by the air blown into the water. In some conditions, the air used to generate those delightful bubbles could even release the virus that causes the dreaded Legionnaire's disease, harmless if swallowed but dangerous if inhaled or breathed in. The Culligan disinfection/filtration treatment for whirlpool water systems is specially designed and constructed to neutralise these risks, and always to ensure that users' relaxation is not only enjoyable, but also healthy and safe.