The Qianjiang sub-dam of the Datengxia Water Conservancy Project is a rock-fill dam with clay core. in which the fine-grained filter material between the clay core and the rock in the dam shell is selected from the artificial medium coarse sand produced by the engineering sand and gravel system. Since the quality of the clay core is directly affected by the performance of the filter m... https://parisnaturalfoodes.shop/product-category/balanced-b-complex/