Consider the following statements regarding Geotubing technology used in coastal protection:

1. Geotubes are large, permeable fabric tubes filled with dredged or hydraulically filled materials that allow water to escape while retaining solid particles.

2. Geotubes are primarily made from polypropylene woven geotextile, ensuring durability and resistance to environmental factors.

3. Geotubes are used as synthetic barriers in seawalls to control erosion caused by waves and tidal action.

4. Geotubes are ineffective in contaminated sites and cannot be adapted to inland waterways.

How many of the above statements are correct?