Support gravel is a graded granular material used in underdrain systems to provide structural support, prevent media migration, and ensure uniform flow distribution in industrial filtration applications.
Support gravel, also known as support media or underdrain gravel, is a carefully sized and graded aggregate material placed in the underdrain system of industrial filters. It serves multiple critical functions: providing a stable foundation for filter media (such as sand or anthracite), preventing fine media particles from entering and clogging the underdrain laterals, promoting uniform water or fluid distribution across the filter bed, and facilitating efficient backwashing during filter regeneration cycles. The material is characterized by its particle size distribution, hardness, and chemical inertness to withstand operational conditions.
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Support gravel provides structural support to filter media, prevents media migration into underdrain laterals, ensures uniform flow distribution, and facilitates effective backwashing in industrial filtration systems.
Support gravel is graded into multiple layers with decreasing particle size from bottom to top (e.g., 64-32 mm at bottom to 4-2 mm at top). This graded approach creates a stable transition zone and prevents clogging.
Hard, chemically inert materials like quartzite, granite, or silica gravel are preferred. They must have high SiO2 content, low acid solubility, and durability to withstand operational stresses.
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