Play It Koi

Joe and Kelly Ostrowski dug their 14,300-gallon koi pond by hand through limestone in New York, edged it with stone from their neighbors' old retaining walls and gave the long stream waterfall a pump of its own. Here's how they built it, what runs it, and a 3D plan of their pond you can explore.

Emerick Peace turned a garden pond in Upper Marlboro, Maryland into a koi pond with a drum filter, a bead filter and a polishing filter. He shares what he got wrong along the way and why he now keeps only female koi.

Ashly Berg dug her own koi pond into a steep front yard in Burien, Washington. One 2 HP pump runs a long, tall waterfall, ten air stones keep the oxygen up, and plants pack every bank. Here is how she built it, what keeps it healthy without a filter, and a 3D plan of her pond you can explore.