Our filtration gravel is naturally hard, rounded to sub rounded and predominantly quartz aggregate. The gravel is thoroughly washed and screened into various sizes and grades as required by the client. We are among the leading manufacturers and Exporter of water filtration gravel, pea gravel and pebbles. The following are characteristics of our gravel material: â?¢ Free of organic impurities â?¢ The grains are smooth and rounded or sub-angular â?¢ It is made of hard, insoluble, siliceous material â?¢ Is uniform in size â?¢ Is quartz based with high silica content