Extrax Phos Adsorption Media 1.3Lb 600Gm Brightwell Aquatics - EXTRAX PHOS &#149; Advanced adsorbent of phosphate and silicate; provides rapid results &#149; May be used on an on-going basis as part of a sensible nutrient-control program &#149; Spherical shape and porosity maximize reactive surface area; promotes reactivity and efficiency by maximizing contact time and minimizing tendency to pack and channel water, and outperforms competing non-spherical phosphate-adsorbent media &#149; Recommended usage is 2 g of Extrax Phos per 1 US-gallon (3