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Currently you are able to watch "H2O: Just Add Water - Season 3" streaming on Amazon Prime Video, Amazon Prime Video with Ads or for free with ads on The Roku Channel. It is also possible to buy "H2O: Just Add Water - Season 3" as download on Amazon Video, Apple TV, Fandango At Home.
When three normal teenage girls stumble upon a ancient cave they undergo a transformation that will change their lives forever. H20 - Just Add Water, sees three very different girls facing everyday teen problems with an added twist - they're mermaids with incredible powers over water.