Swimming pool with blue water is associated with relaxation and resting in a warm climate, whereas a villa with a swimming pool located in a beautiful garden is a synonym of luxury for many people. Interestingly, Hollywood stars are not the first wealthy people for whom having a pool becomes a status symbol of wealth. Since the times of the ancient Romans the wealthiest citizens have built beautiful villas with swimming pools. The majority of the Roman houses had indeed swimming pools, but only the wealthiest citizens could have afforded a swimming pool in the garden or on a coastal island.