NEW DESIGN ! Moving Bed Filter Media Better Than Kaldnes K1 Aquarium Pond Koi
Removing ammonia and nitrites from your water is essential for healthy koi (fish). Upgraded K1 (5 chamber) Size:10mm dia. X 7mm approx. K1 Size (4 chambers):11mm dia. x 7mm approx. each piece - with a surface area of >900 m2/m3 (approx.).