Thread: Corner bottom drain

I inherited a pond that currently uses a submersible pump to draw water into a single bucket filled with filter media, which then overflows back into the pond. I want to improve the filtration system but prefer not to rebuild the entire pond. My plan is to set up a 3-barrel filter system: 2 mechanical filters and 1 bio/sump filter.

The pond already has a drain in one corner (the lowest point, with the pond sloping towards it) that’s connected to a ball valve outside, acting as the main drain. My idea is to connect a pipe from this ball valve to my 3-chamber filter system.

My question is: How efficient will this corner drain be compared to a bottom drain located at the center of the pond? Will it work on the same principle?

Additional info: The corner drain is only 2 inches, will that suffice in a ~2 thousand liter pond?