large surface area for maximum flow. Sand filters are one of the most popular ways to filter water. They are simple, effective, and require very little attention. Pool water is routed through a sand-filled pressure vessel. The sand traps particles as small as 20 microns in size (particles smaller than 40 microns cannot even be seen by the naked eye). Over time, dirt accumulates in the spaces between the sand particles causing the pressure in the vessel to rise as water finds it harder to pass through. This signals you to "backwash" the filter. Simply reverse the water flow and "knock out" the dirt. It's that simple.
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