Looking for a natural hydroponics substrate that is free of heavy metals and other contaminates? Then choose Gold Label Hydroton Clay Pebbles. The substrate of professional growers, these clay pebbles are formulated with the highest-quality pure clays, then baked in an open furnace to ensure they're free of contaminates. RHP for Horticulture quality certified, they come in a range of different sizes including 8-16mm, 4-8mm and 16-25mm, all with uneven shapes that provide the perfect surface for good bacteria and your plant's roots. Their unique porous structure means they are equally suitable for top irrigation systems and ebb/flood systems, thanks to their high water capacity.ag
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