Filter Rocks and Aggregates

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Decorative rocks, gravel rock, construction aggregates and filter media rocks from George Throop Company in Pasadena, CAOur water filter rock consists of coarse aggregates in which a high proportion of the particles are rounded and tend toward a generally spherical or equi-dimensional shape. This filter media gravel rock posses’ sufficient strength and hardness to resist degradation during handling and are substantially free of deleterious materials.

Filter rock or filter gravel is used primarily for water filtration applications. Our filter rock meets most current AWWA B100 specifications. We can acquire NSF/ANSI Standard 61 when requested. We inventory a wide range of filter rock for a variety of applications. Each different type and size of filter rock serves as an excellent support for a mixed media filter system.

Gravel, aggregates and filter media filter rocks and gravel rock for construction and water filtration in bulkOur filter rock meets the following specifications:

  • Gradation
  • Cleanliness
  • Specific gravity
  • Acid solubility
  • Percent of flat elongated particles
  • Percent of broken face pieces

Filter rock purchased from the George L. Throop Company can be purchased in 50 lb, 100 lb sacks, 3,000 lb supersacks, or in bulk. We can load flat bed or van-style trucks or containers for shipment all over the United States and for overseas shipments.

Available filter rock media sizes include:

  • 1/8″ x 1/4″
  • 1/4″ x 3/8″
  • 1/4″ x 1/2″
  • 3/8″ x 5/8″
  • 3/8″ x 3/4″
  • 1/2″ x 3/4″
  • 1/2″ x 1″
  • 5/8″ x 1″
  • 3/4″ x 1″
  • 3/4″ x 1-1/2″
  • 1″ x 2″
  • 1-1/2″ x 2-1/2″

Call us about your filter project and we can help find the right filter rock or filter gravel material for your water filtration project.