How many h2o shows do they have?

As of October 2023, H2O has produced a total of three series: "H2O: Just Add Water," "H2O: Mermaid Adventures," and "Mako: Island of Secrets." The original series aired from 2006 to 2010 and gained significant popularity, leading to the creation of the spin-offs. If you're looking for specific details about each series or related media, please let me know!