Shape and Type

Benefit

1. Convenient installation process and reasonable construction costs

2. Fast construction as it is able to be constructed the length for one roll (32?-450m, 50?-220m) at once

3 .No joint construction, no joint detaching problem

4. Larger water flow area increases drain performance

5. Spiral bundle with high stiffness prevents the reduction of water flow cross section due to upper earth pressure

6. Convenient construction regardless of grade

7. Can be made to satisfy various standards according to designated drain amount

8. Dissolved oxygen maximizes in fluid flow – eco-friendly