Director Nicolás López practised what the movie preaches in his marketing campaign for the film.
"We used Facebook marketing with the 'no filter' concept.
"All the actors did videos saying everything they hated about Chilean society, and they went viral," he told Variety.
Chile held a National No Filter Day when people were encouraged to speak their mind, and special screenings for women were arranged.
"People wanted to express their discontent about life. This is not a movie about big themes.
"This is a movie about small themes; the apathy of millennials, ageism, sexting, online relationships - and it shows a world that's happening right now."
Will Pía end up happy with her anxious, pill-popping self, or will she make a leap to full-fledged modern-age warrior?
Audiences in Chile loved the roller coaster ride, but it touches a nerve in every country.
"What we've learnt is that the movie is extremely relatable, no matter where you live.
"In China they say the movie is extremely Chinese, same thing in México and Spain," says López.
No filter (Sin Filtro) screens at the Davis Lecture Theatre, Whanganui Regional Museum, Watt St, on Saturday, October 21 at 4pm. Entry is free, koha appreciated.