Biosolvit Substrates are 100% tannin free. Present in coconut fiber, bark and pine, and in many other materials used as a base for substrates, tannin is harmful to plants as it inhibits their root growth. In other products, the sterilization capable of removing the tannin also ends up with the good micro and macro biota of the substrate, which guarantees the precise and gradual release of nutrients for your plant.
Your walls are thick enough
Made with vegetable fibers and natural binders
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