| 摘要 |
<p>This invention relates to a ground-based water filtration system where the residue of the filtration is sent back to the earth. This is based on the natural filtration system where the layers of soil in the ground filter the water. This invention can be mainly used in areas where pollutants like iron, fluoride and arsenic are present. This invention works well in both small and large scale in an efficient, cost effective and environmentally benign manner.</p> |
