Recirculation systems could be operated fewer hours. The obvious advantage here is a more polished body of water however it may also extend to energy savings. Clearer water: The study showed a 25-percent reduction in National Turbidity Unit Readings.The lighter material floats more easily, the study noted, allowing it to fluidize quicker, reducing backwash runtimes. The improved performance can be attributed to glass’ lower density, with approximately 20 percent less volume by weight than sand. That’s equates to a 23-percent reduction in water. Less water: The average duration of backwashing (in minutes) was 2:34 compared to 3:21 for sand.In a field study performed by the Clean Washington Center, researchers replaced 1,950 pounds of sand from three high-rate filters with recycled glass and analyzed the results for approximately nine months. Glass is more resistance to breakdown through filtration backwashing cycles, which minimizes cracks where bacteria can lodge and resist flushing in backwashing.Ī Washington state nonprofit put this to the test. Many cases techs find that it only needs to be cleaned with chlorine or acid, and topped off with a fresh layer. This DE-quality filtration can be achieved without chloramine-producing flocculants and shock treatments, says one manufacturer, which is one reason glass is most commonly found at indoor pools where air quality is a top concern. Some brand claims go as low as 3 microns. Proponents also say glass has a tighter turbid catch, with an ability to filter down to 9 microns. This is because glass, which is less dense than sand, doesn’t pack as tight. This weak charge releases the particles upon backwashing for a more efficient cleansing. 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. It’s recommended to be replaced every five to eight years, as the grains eventually breakdown. The filtration takes place through the top 6 inches, where the gunk builds up. In commercial settings, it needs to be backwashed frequently - at least once a week for large-volume public pools. Sand can clump, calcify and create channels where water slips through unfiltered. The most common sand filter media is 20-grade silica, which creates a mesh so tight it can sieve particles as small as 20 microns. In order for the filter to be effective, each grain of sand must be roughly the same size, generally 0.4 to 0.6 millimeters. As more dirt is captured in the sand bed, it becomes capable of filtering finer and finer particulate, up to a point. Solid turbid particles become lodged into the sand bed. That leaves scrap glass to a limited market, which makes it perfect alternative to sand for the pool industry. Most beverage companies won’t use cullet for new bottles because, they want pretty bottles. Glass filtration is the product not only of the industry’s never-ending search for the best media, but also the generous supply of recycled glass. The majority of recycling programs do not separate bottles by color, so when the glass is crushed, the result is a mix of brown, green and clear shards called cullet. The glass filtration was first introduced in the late 1990s, is catching on as a direct alternative to sand.
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