Kyowa,founded in 1969,is the leading company in the Japanese market for mesh sheets and safety nets for industry and construction. 　
The Filter Unit was used for the first time in 1987,to protect the foundations of the great bridge at Akashi(world's longest span,with a total length of 3,911m).
For more than 20 years,the Filter Unit has been widely used in civil engineering for rivers and coastal works.

Over 16,000 reference sites in Japan,with over 600,000 Filter Units installed.

• 1995,1998,2000 & 2004,Certificate of Technical Testing,awarded by the Public Works Research Institute (Japanese national testing body)
  
• 2004 the Eco-Green type is awarded the "Eco mark"label
  
• Since 1996,Filter Units have been part of the equipment used by the Japanese Civil Defense forces
  
• 2008 Filter Unit achieve CE Marking for 3 types of products,durability under UV exposure up to 30 years, depending on quality