Micron fiberglass sand filters are constructed from a blow moulded inner shell of fibreglass reinforced polyester resin over wound with fibreglass filament.

Micron fiberglass sand filters operate on the basis of “depth filtration”; dirt is driven through the sand bed and trapped in minute spaces between the particles of sand. Cleansing the filter simply requires turning the filter’s Multiport lever from the "filter" position to the "backwash position, which reverses the flow of water in the filter, flushing the filter bed.