Last fall I decided to build a larger pond, from 800 gallons to 5,000 gallons.
I did plenty of research on filtration. I didn't want to build a big pond and have filtration issues.
I included a bottom drain that flows into a 500 gallon settling chamber, which is pumped into my 150 gallon skippy filter (filled with cut up flow polisher pads), flowing into my water falls.
I then have my skimmer, and another 250 or so gallon holding tank, which is pumped through a UV filter and back into the pond, to circulate the water.
Once I get the landscaping done around the pond I will be adding another 150 gallon stock tank and probably add some bog plants.
I know I over did it on filtration, but you are always better to have too much then not enough.
I am 2 1/2 feet above ground. Easier to keep my daughters out of the pond, and saved me a lot of digging!
Here is a pic of my skippy filter.
Settling Chamber.
Skimmer.
Spring of this year. I've since added my retaining wall block around the pond. It is 12' x 12' and 5+ feet deep.