Active substrate for aquariums. Active soil influences water parameters and adjusts them to a pH range that is favorable for most aquarium plants. Nutrient reservoir: It can absorb nutrients from the water and release them when needed - the buffering effect is ideal for healthy plant growth. Naturally appearing grain size - suitable for small, medium, and larger aquascapes, providing good support for plant roots. Color: Brown. Grain size: 2 - 4 mm. Package size: 2.7 kg. The active substrate lowers water hardness, has an attractive appearance, and promotes optimal plant growth. It establishes a slightly acidic pH range, which is beneficial for most aquarium plants as it facilitates nutrient uptake. Additionally, the active soil absorbs nutrients from the water and releases them as needed - this buffering effect is ideal for sustainable plant growth. The grain size of our ScaperLine soil is suitable for small to large aquascapes and provides good support for plant roots. The soil granules are fired at lower temperatures, making them pleasantly stable but not too hard. The soil does not tend to compact, ensuring a favorable root environment in the aquascape.