The FloraFlex 9''-12'' Round Flood and Drip Shield w/ Gravity Dripper is the World's Slowest Drip System that instantly gives you control over your feeding plan.. Place the Round Flood and Drip Shield on top of your plant and use the built in measuring table to fill the reservoir with water and nutrients. Compatible with any 3-5 gallon pot with a 9''-12'' diameter.