Solid fertilizer in powdery granules that contains trace elements in addition to macro and micro nutrients essential for plants which are released slowly into water for absorption by leaves and roots. Its natural composition (crumbled pumice of volcanic lava and laterite) ensures an optimal CEC (cation exchange capacity) for the roots and for a luxuriant growth avoiding the yellowing and the detachment of the leaves. Thanks to its porous structure, it keeps the bottom ventilated, avoiding the formation of rotten areas toxic to roots and fish. It does not reduce temporary hardness (KH) and keeps the pH stable. It does not contain substances that help the formation of nitrates and phosphates in the aquarium and must be placed on the bottom but not in contact with water, so it must be covered with sand or gravel, creating a top layer of at least 4cm. Use: About 2kg of product per 1000square centimeters of aquarium bottom surface to recreate a substrate of about 1.5-2cm. Rinse thoroughly under water before placing in the aquarium, The presence of dust and turbidity of the water, at first use, is completely natural. In the following 24-48 hours the water will return clear and then rinse the pre-filter (cotton wool and/or sponge).