Anjon Manufacturing 1.5" Bio Balls - 2.7 Cubic Feet

Back in the day lava rock was an effective media to cultivate beneficial bacteria in Koi ponds and water gardens. Problem is...lava rock 'slimes over' in a matter of weeks and loses its effectiveness.

Bio Balls, with their unique geometric design, have a very large surface area to dramatically increase beneficial bacteria growth. Bio balls allow you to come safely maintain higher fish loads with the same pump and filter.