The renewed Helix flakes have been increased in size and surface. For even better biological filtration, the specific surface area for bacterial attachment is now more than 5,000m²/m³! Size: ± Ø30 mm, thickness: ± 1.1 mm. Specific surface area: > 5.000 m²/m³. Material: HDPE. Density: ± 0.75 kg/dm³. Weight: ± 150 kg/m³.
