... and increase wettability. Igel-ball/water treatment Igel -ball is a common bio-filter, though long-term improvements of its structure, it has ... by: small water resistance, excellent air permeability, the majority of bio-ball diversion design, such as the diversion board, lead groove ... the growth of beneficial bacteria in pond filters, fish farm, and aquarium.Igel Ball is usually employed via a wet/dry ...