Poolline recommends glass sand as active filter material. It provides higher filtration and purification compared to its equivalents. It decreases the need for chlorine and precipitator therefore you use less chemicals. The filter bed is clogged less and it also decreases the backwashing process by 50%. It is also environment friendly as it is made from glass. As it does not contain free silica, it is safer compared to quartz. Quartz is the name given to the pure silicon cyristals that can be found in nature easily. Filter active materials glass sand can be used in drinkable water purification facilities, swimming pools, cooling towers, big aquarium open to public, ornamental pools, fish farming and in all filtration systems.