Sand is one of the nest ...

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Sand is one of the nest Filter media. Depending on the MICRON, it can block all Suspended Solids right up the "Micron level"  permitted (depending on the kind of sand). It also blocks Biological Fouling. All of this depends on the kinds of sands available and selected. The bigger Micron Sands go at the bottom and graduate upwards according to Micron Levels and needs. 

The choice of the micron Levels is in the design engineering which is contingent on the Water Analysis and desired results.

All Sands can be "Backwashed"

The use of "Beach Well" has proved very good and effective in Desalination of sea water.

There are many more factors to be considered and applied. I shall be happy reply in person on:  etsi412@aol.com

Justin Sharaf (www.ecotechsi.com)