Place the 9 -12 in Round Flood & Drip Shield on top of your plant, and you will instantly have control over your feeding plan. This product is the perfect base tool for a top feeder or someone who enjoys the benefits of a drip system and likes the results of a top feed. Eliminates algae and pesticides by covering the media. Built-in overflow where excess water and nutrients are delivered straight to the root ball. BPA and lead-free rubber. Instantly transforms from a top feed to a top-feeding drip system with the Barbed Insert.