<p>Replace sand with Rx Clear Luster Filter Media in your pools sand filter. Reusable, eco-friendly and made from 100% polyethylene, these tiny balls will last several pool seasons while filtering particles down to 5 - 3 microns. Clarifiers should not be used with this product.</p> <br> <p> <strong>Product Features:</strong> </p> <br> <li>Alternative to Sand</li> <li>High Dirt Capacity</li> <li>Lowest Pressure Increase</li> <li>No Clogging</li> <li>Lowest Backwash Frequency</li> <li>Long Product Life</li> <li>Easy Disposal, Non Toxic</li> <li>Light Weight for Easy Handling</li> <li>Filters particles down to 5-3 microns</li>A pea gravel base is recommended with use of this product. Just layer pea gravel above laterals to cover them.