So there won't be a season 4 for H2O just add water? :(

No :( I know I'm super sad to! They stopped the production of H20 Just Add Water because the girls were to old to act in that show. They were all around the age of 20. Anyway the good news is Jonathan didn't give up on mermaids. He is making a new series call Mako মৎসকুমারী অথবা Mako: Island of Secrets if আপনি live in Australia. It's about three girls who are already মৎসকুমারী and have to protect Mako Island. Some episodes are already out on Netflix. I've been watching them on YouTube and Ten Network online. Even though the series is going on I did hear something about a H20 movie although I don't know if it's completely true. Hope I helped!

I WAS VERY SAD ALSO WHEN I HEARD THAT I WISH THERE WERE MORE