FloraFlex Circulators 12pkThe FloraFlex Matrix Circulator is part of the Matrix System, a patent pending first of its kind Top Feeding Wicking System that provides the most even way to deliver water and nutrients to your plants. It can be used with pots ranging from 7. 5 18 inch diameters. You will need a Matrix unit, the same size Matrix Pad, and the correlating Matrix Circulator. Water and the nutrients travel into the Circulator, hit the slope of the Matrix and are pushed