Rx Clear Radiant Sand Filter w/ Black Luster Balls (Various Sizes). The Rx Clear® Radiant Sand Filter features a high-capacity sand filter that catches debris and extends filter cycles. The filter is designed to handle the filtration of your pool water with its one-piece blow-molded tank that includes a skirt/base for the filter only. The included black luster media is economically friendly and lightweight. Made with absorption and optimal filtering in mind the luster media can filter down to 3-5 microns while the traditional sand filter can filter down to 20 microns. This media only needs to be replaced every 5 years and is similar to charcoal as it absorbs all the chlorine smell and taste from your pool’s water. A pea gravel base is recommended with the use of this product. Note: The 16″, 19″ and 22″ filter tanks are for above ground pools and the 24″ tank is for an inground pool. Blow molded filter tank. Each filter system comes with the appropriate amount of black luster media. 16 Filter = 3 boxes. 19 Filter = 4 boxes. 22 Filter = 5 boxes. 24 Filter = 6 boxes. The chart below depicts the sand/zeo-clear capacity for common sand filter models as well as the pump size recommended for each model. Recommended For Pools Up To. 1 1/2 HP Extreme. 1 HP Mighty Niagara.