Gerui also has the sub-brand of ?Letou?. The products cover water filtration, gas filtration and air filtration. It can produce 100 million pieces of filter cartridges per year, and also have a lot of patent technologies. The company is the appeal of ?health, environmental protection, science and technology?. We have a lot of home and abroad certificates, such as ISO 9001 quality certificate, Healthy and Safety of drinking water by China, and it has become the member of ?WQA? of American.