The FloraFlex 6'' Square Flood and Drip Shield + Gravity Drippers is the World’s Slowest Drip System that instantly gives you control over your feeding plan. This product can be used in both the vegetative and flowering stages, however we recommend using the FloraCap throughout the vegetative phase and this unit primarily in the flower stage. Place the Square Flood and Drip Shield on top of your 6'' rockwool cube and use the built in measuring table to fill the reservoir with water and nutrients. Gravity Drippers pop into the 4 holes and slowly deliver the exact amount of water and nutrients you want to distribute to your plants. Take your system a step further and use the barbed nozzle to transform into an automated top-feeding drip system. 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. It eliminates algae by covering the top of the media.