Tetra ActiveSubstrateNatural substrate which provides a plant-friendly soil climate and lush healthy plant growth. The large surface and the porous structure of the water neutral clay granules offer several advantages compared to conventional gravel.Promotes the settlement of beneficial soil bacteria- Reduces organic water pollution- Relieves the filter and ensures clearer water- Supports the cycling time of the aquariumAvoids the formation of soil compaction- Provides an optimal soil structure- Prevents root rotBenefits the fast rooting of plants- Guarantees a firm grip as also fine roots are able to anchor in the clay poresProvides plant roots optimally with nutrients- Allows a constant water circulation by 50 % more water permeability compared to conventional gravel- Promotes a strong and healthy plant growth