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| Spec | Density | Surface Area | Life Span | Material |
| Φ13*13mm | 0.94-0.98g/cm3 | 650-800m2/m3 | >15years | HDPE |
Special design of surface, stronger bio-film growth capacity;
Large specific surface area, high voidage, the more periphyton biomass;
Unique design of structure and shape according to hydromechanics, strong three-dimensional flow dynamics in the water;
Adding hydrophilic groups and other trace elements, the biofilm formation time only 3-15 days;
Excellent impact strength, strong gas shear capacity;
Without any holder, easy to cure, save energy and space.