it's not stupid question at all...
Yes, it's like hot springs, but at first there were those hot sprongs with REALLLLLY hot water, so people made it not so hot..so it's half natural...but that water is good for example if you have maybe some lil skin problems, it helps to get your skin better.. but WARNING if someone's going to go there I have advice, do not get there wet hair, because you willn't be able to brush them after swimming..it's because in the water is very much that salt so it's not good for your hair... LOL.. but anyway it's awesome place...

I was just wondering, why those people who're taking tourists to Blue Lagoon don't say then anything about that it's better to not get there wet hair... I just saw once very unlucky woman after swimming, because she couldn't brush her hair.. I just said her, that she can try to wash them again with lots fo shampoon