FloraFlex 15.5" Matrix Pad - 12 PackDescription The FloraFlex Matrix Pad 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'' Diameters. You will need a Matrix unit, the same size Matrix Pad, and the correlating Matrix Circulator. Water and nutrients travel into the Circulator, hit the slope of the Matrix and are pushed