Glass has a slight negative charge on the surface to attract fine particles, which cling to the media like static-charged socks to a sweater. This weak charge releases the particles upon backwashing for a more efficient cleansing. This is because glass, which is less dense than sand, doesn’t pack as tight. Proponents also say glass has a tighter turbid catch, with an ability to filter down to 2 microns. Some brand claims go as low as 1 microns. This DE-quality filtration can be achieved without chloramine-producing flocculants and shock treatments, which is one reason glass is most commonly found at indoor pools where air quality is a top concern.
It will last up to last 10 years or longer. Many cases techs find that it only needs to be cleaned with chlorine or acid, and topped off with a fresh layer.
Glass is more resistance to breakdown through filtration backwashing cycles, which minimizes cracks where bacteria can lodge and resist flushing in backwashing.
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