Hello all

I recently got meself a 3ft DIY pond in my balcony. I also have an internal filter thats supposed to do 1000l/hr. But it died on me yesterday. Also I don't think it's suitable for a pond like this. My water is also turning green due to sunlight.
Read it somewhere that I will need a bio-filter. Don't know how it looks like. Maybe some of you pond experts out there will give me some idea of this bio-filter and the solution to green water.

Thank you and regards.