Yes, it is a net with rocks

More than 700,000 of these Kyowa Filter Unit rock bags have been used around the world in the last 30 years.
That means it is proven and tested.
Guess what: Now available in Australia and New Zealand too.
The concept is simple and works well.
Fill very strong Kyowa Filter Unit rock bags with (your own) rocks and use them to protect assets, for river bank protection, to protect submerged cables, bridge pylons, temporary walls and cofferdams.
Kyowa Filter Unit rock bags (patented) are even used to protect the banks of the Thames at London Bridge.
The first Kyowa Filter Unit rock bags have already been delivered for a project development near the Brisbane River.
When the grass grows over them you will not even see them anymore.
Natural, sustainable, environmentally friendly and… we have enough rocks.