Epic Pond Bio-Balls Biological Filter Media are black, 1.5" diameter, high density polyethylene. This quality media is an excellent choice for use in Koi pond filters and water garden filtration systems. Made in the USA. To maximize value for our customers, we offer our Bioballs in case quantities only. Each case includes 2,000 bioballs.
Epic Pond Bio-Balls Biological Filter Media - 2000 Count