Decrepit Filtration

I wonder what used to be filtered through these pipes and why they're not used anymore. What happened?

I wonder what used to be filtered through these pipes and why they're not used anymore. What happened?

Timelapse.

An old filtration pipe overgrown by wet looking vines, algae and mold. One side of the pipe seems to be broken open. The big grilles inside the pipe are partially broken and blue light is shining in from the top. Old stickers and graffiti can be seen on metal the inner walls.

Aesthetic is inspired by Rain World.