What is a sand-anthracite filter?
A sand-anthracite filter or dual media filter/multi-media filter is primarily used for the removal of turbidity and suspended solids as low as 10-20 microns. Inside a sand-anthracite filter is a layered bed of filter media. The bed is graded from bottom to top as follows: 1st layer = gravel support bed 2nd layer = 2mm filter sand 3rd layer = fine filter sand 4th layer = anthracite Having the filter media graded this way enables the sand anthracite filter to run for longer times before a backwash is necessary.
