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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 buy it as download on Apple TV.
H2O: Just Add Water is available to watch for free today. If you are in Canada, you can:
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.