<P> Filtration is any of various mechanical , physical or biological operations that separate solids from fluids ( liquids or gases ) by adding a medium through which only the fluid can pass . The fluid that passes through is called the filtrate . In physical filters oversize solids in the fluid are retained and in biological filters particulates are trapped and ingested and metabolites are retained and removed . However , the separation is not complete ; solids will be contaminated with some fluid and filtrate will contain fine particles ( depending on the pore size , filter thickness and biological activity ) . Filtration occurs both in nature and in engineered systems ; there are biological , geological , and industrial forms . For example , in animals ( including humans ) , renal filtration removes wastes from the blood , and in water treatment and sewage treatment , undesirable constituents are removed by absorption into a biological film grown on or in the filter medium , as in slow sand filtration . </P>
<P> Filtration is any of various mechanical , physical or biological operations that separate solids from fluids ( liquids or gases ) by adding a medium through which only the fluid can pass . The fluid that passes through is called the filtrate . In physical filters oversize solids in the fluid are retained and in biological filters particulates are trapped and ingested and metabolites are retained and removed . However , the separation is not complete ; solids will be contaminated with some fluid and filtrate will contain fine particles ( depending on the pore size , filter thickness and biological activity ) . Filtration occurs both in nature and in engineered systems ; there are biological , geological , and industrial forms . For example , in animals ( including humans ) , renal filtration removes wastes from the blood , and in water treatment and sewage treatment , undesirable constituents are removed by absorption into a biological film grown on or in the filter medium , as in slow sand filtration . </P>
property of earth to allow water to pass through it is known as
property of earth to allow water to pass through it is known as
Filtration
Filtration