<P> H O: Just Add Water, also known as H O, is an Australian dramatic fantasy television programme for children and teenagers created by Jonathan M. Shiff . It first screened on Australia's Network Ten and runs in syndication on channels in over 120 countries and has a worldwide audience of more than 250 million . It was filmed on location at Sea World and other locations on the Gold Coast . The show revolves around three teenage girls facing everyday teen problems with an added twist: they're mermaids with powers over water . </P> <P> Only two series with a total of 52 episodes were originally planned, but due to popular demand, a third series was filmed . Series one premiered in July 2006, followed by series two in September 2007 . Series three first aired in the United Kingdom in October 2009, with the Australian premiere occurring in May 2010 . </P> <P> Rikki Chadwick, Emma Gilbert, and Cleo Sertori are three teenage Australian girls who find themselves stranded on the mysterious Mako Island, where they end up in a pool under a dormant volcano just as a full moon passes overhead, bathing the pool in light . The girls are rescued and brought back to shore, where they return to their normal lives, until discovering their lives have become anything but normal . The girls find out that ten seconds after coming into contact with water they transform into mermaids . After further experimentation, the girls also discover they have supernatural powers over water . The trio enlist the help of Cleo's friend Lewis McCartney to help them keep their secret . </P> <P> Everyday situations, such as bathing and dealing with rainy weather, become tricky as the girls struggle with their newfound abilities, which come with many advantages and disadvantages, while also trying to keep them a secret from everyone else, including their families . They soon adapt to their new abilities and lifestyles . </P>

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