For koi and larger ponds

an internal water depth of 15

Dual linear diaphragm compressor provides maximum air output

Example: A round pond that has a 12' diameter and is 1

Adaptable to harsh environment

Atlantic Water Gardens Black Media Bag 18"x 22" uv parts For koi and larger pondsAtlantic Water Gardens Black Media Bag 18"x 22" Expanded clay Bio Rocks provide an optimal environment for beneficial bacterial colonization due to their high surface area. They are also more stable and less abrasive than lava rock and gravel, while still providing all of the surface area. Bio Rocks are easy to clean and have a 5 year warranty. Use one box of Bio Rocks per BG2234 Media Bag. FEATURES Atlantic's Media Bags are made with triple stitched,