![The natural volcano swimming pool at Porto Moniz, Madeira.](https://i.guim.co.uk/img/media/567a70b871d6c72ecdbf50d7e01919b17ca45087/0_0_5400_3240/master/5400.jpg?w=300&q=55&auto=format&usm=12&fit=max&s=6cde5891ca7eda6ce42a90d429e7b9ab)
We usually focus on indoor swimming pools on this blog, but a
recent article by the Guardian provides an opportunity to take a look at some of the best seawater pools in Europe. No chlorine, pH correction, dilution, circulation, filtration, coagulation or heating required.
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