FloraFlex Round Flood & DripShield - 2 mm Gravity Drippers Place your Flood & Drip Shield on the top of almost any three to five-gallon pot with a diameter of 9-12 inch, and use it along with a variety of interchangeable products such as the Worlds Slowest Drippers, aka the Gravity Drippers, as well as the Quicker Drippers and Eliminators Eliminates algae and pesticides by covering the media Built-in overflow where excess water and nutrients are delivered straight to the root ball