There isn't a series 4 the creator sinabi no series 4 maybe a movie but there's a wonderful spin off series called mako mga sirena an h2o adventure and if there was a h2o series four it would have been aired three years nakaraan xD
When I pag-ibig mako mga sirena I wonder when exactly h2.0 just add water season 4 coming soon on Netflix what when there were going to put the big news about the series about this new ipakita about season 4 just add water I’m really so disappointing absolutely especially our audience new reporters about the new release petsa relationships new on Netflix