Grodan Stonewool MacroPlugs (Case of 35 Bags) Environment Unlike dry soluble fertilizers

Unlike dry soluble fertilizers

Monitor EC regularly and adjust accordingly based on the crop and growth stage

Honors the full color spectrum of light

High-output 11-gpm flow rate at 40 psi is unmatched by other trigger valves

Calibration is simple with one push button on the meter and fresh Bluelab Calibration Solutions

Grodan Stonewool MacroPlugs (Case of 35 Bags) Environment Unlike dry soluble fertilizersMacroPlugs are 1. 5 in round with a slit that allows easy insertion of a cutting. These loose round plugs fit perfectly into the Gro Block hole. For best results, always insert MacroPlugs in a tray with individual cells. The individual cell will make sure the plug stays closed around the stem of your cutting.