The FloraFlex^® 7.5"-12" Universal Round FloraCap^® is a patent pending revolutionary tool for top feeding that also helps eliminate algae. The FloraCap^® is designed to give you a more consistent flow rate, even distribution, increased air flow, and stabilization. Fill the cap with water and nutrients by hand or automate with FloraClips. The FloraCap^® strategically covers the top of the media allowing the root zones to dry at a more consistent rate and delivering the necessary oxygen your plants need to thrive. Algae disappears, healthy roots fill the medium, and blossoms multiply.