The best practical answer ...
Published by Antone Austin, Water Consultant at AWIA
The best practical answer for your question can be derived from watts .com web site http://www.watts.com
Multimedia sand filtration: This system is similar to the rapid sand filtration method.
Figure 14: MULTI-MEDIA SAND FILTRATION

2 Comments
One of the beds can also be zeolite depending on content of Se or others similar if "tile" water.
Published by John Salonich, Vice President / Managing Director
Sir,this a much better i am now working with Multi media sand filter.very good result.
Published by Digamber Jadhav