PhosGuard， 4 L / 1 gal.</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Rapidly Removes Phosphate And Silicate From Marine And Freshwater Aquaria</li><li>Highly Porous For High Capacity And Bead Shaped For Optimum Water Flow</li><li>Outperforms all competing products</li><li>Not Recommended For Phosphate Based Buffers In Freshwater Aquaria</li><li>250 Milliliters Easily Treats Over 75 Us Gallons</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/51hTi61yyzL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/31Hdq0Q0DfL.jpg' noproxy></br>