Pebbles / quartz gravel refers weathered rock by the water particle from the long-term handling of 60 ~ 200mm non-angular natural aggregates; than 200mm were called boulder gravel (gravel) is a very long time, gradually formed. . of gravel (gravel) formation process can be divided into two phases, the first rock weathering, collapse stage; the second stage is the rock stage by river transport and rounded pebbles in a river pebbles contained within its. The reason is that the formation of broken rock, only long-distance transport to make edges disappear, forming stone cylinder, cone or ellipsoid (or pebbles, gravel), and then by cementation of rock called gravel.
Cobblestone supporting layer media, is the result of natural river excavation, screening, selected from water, the spherical shape of pure color and variegated, the product free of impurities, for waterworks, mechanical filters, anion and cation exchange, etc. will Preparation of material indicators are in line GJ24.1 standards.

Technical Specifications:

Analysis Project Test Data Analysis Project Test Data
Silica ≥98% hydrochloric acid soluble rate ≤0.2%
Density of 2.6g / cm3 capacity 1.85g / cm3
Clay content (1.1% mechanical strength 7.5

Pebbles are various filter media are essential cushion, I produced natural type pebble (elliptical shaped variegated form) and the machining type pebble (nearly spherical, pink and white) stone hard, anti- pressure resistant, is the best cushion filter material, common specifications: 2-44-88-1616-2525-3232-50.

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