Pebbles (gravel) filter Product Details: 1, I plant the pebbles, quartz gravel supporting layer media is the result of natural river dredging, artificial, screening, washing from the spherical shape cobblestone manufacturer, pure white or hybrid color, this product is no noise, density 2.66, bulk density 1.85g / cm3, hydrochloric acid soluble rate of 0.12%, Mohs hardness 1.22 × 10Pa, including soil volume ≤1, the mechanical strength of 7.0 for the water plant, mechanical filters , anion and cation exchange and other essential materials. The indicators are in line with CJ24.1 standards. 2, pebbles, sand-attached products are mined cobblestone paving, named because of the shape of goose egg. As a natural pebble stone, from experienced crustal movement of millions of years ago after the old riverbed gravel mountain uplift produced, experiencing the impact of flash floods, water removal process of continuous extrusion, friction. Tens of thousands of years of tremendous evolution, they tormented waves flush the movement, the collision was gravel friction lost irregular edges, and sediment has been buried in an underground silence of millions of years. That may be the river erosion, but also between the rubbing together. That pebble you may flood history, mudslides caused (because it is in the mountains), but depends on the specific cause there's geological structure, geographical environment pebbles, also need to refer to other mountains surrounding the case. As trees grow tall mountain may not be the reason or the soil around the tree species and biological ties caused. About the Mesozoic in 100 million years ago, in the role of crustal movement pebbles, lava emerge surface, then rapidly cooled lava formed granite. Thereafter dating back thousands of years, since the granite magma intrusion caused dislocation squeeze, resulting in a large number of smaller pebble stones, those stones at the water's edge, after a long period of slow erosion and water itself Scroll to each other, culminating in today's cobblestone. Pebble is a very long time, and gradually formed due to crustal movement and other forces of nature weathering shock, and then after flash floods impact, water handling and gravel between repeated rolling friction, and finally formed a lovely rounded shape pebbles. Mentougou cobblestone cobblestone manufacturers _ _ Saatchi & Saatchi water provided by the water purification materials Co., Ltd., Henan. Mentougou cobblestone cobblestone manufacturers _ _ Saatchi & Saatchi in Henan water purification Material Co., Ltd. (www.gyssjs.com) this year introduced a new upgrade, the above picture is for reference only, please call the telephone or pictures on this page, for the latest Information, Contact: Zhang.