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Inert root media such as rockwool
It is suitable for growing in pots and open soil and both in and outdoors
Includes: 2-stage 10 in filter unit
Colormark models include a 30in anodized aluminum extension handle
Grodan Stonewool MacroPlugs Ventilation Inert root media such asMacroPlugs 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.
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