PhosGuard， 2 L / 67.6 oz.<div style="text-align: left;"><strong>[Product Information]</strong><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><img src="http://ecx.images-amazon.com/images/I/51yuyQdLx8L.jpg" noproxy>