Algarve and South of PortugalThe Algarve, in the south of Portugal has hard water, high mineral content and added chlorine in the treatment stage. Most locals use bottled water for drinking and tap water for cooking, laundry, bathing, etc.
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The Ocean water temperature in the Algarve is usually between 12ºC in Winter and 25ºC during Summer, peaking at its highest between August and September.
While there's no obligation to tip in Portugal, it's also important to remember that when you do leave a tip, it's essential to use cash euros (the European currency), so the recipient of your tip can easily use the money without having to make a special trip to a bank (and then pay a transfer fee).
Praia do Vale de Centeanes is where you'll want to go to see some of the clearest water in the Algarve. On a clear day, it's easy to see the bottom of the ocean without even setting foot in the water. This beach is located near Carvoeiro, so it won't be hard to travel from here to Praia da Marinha or Praia de Benagil.
Ponta da Piedade in Lagos is THE must see emblematic site of the Algarve. The landscape is incredible and well worth the trip. The view is stunning from the top of the cliffs: you can see the caves and underwater cavities dug by the swell and into which transparent water rushes.