Slow dissolving BioTabs fertilizer tablets that slowly increase the fertility of the substrate. They improve nutrient uptake and promote even healthy plant growth. Tablets with slow release organic fertilizer NPK: 15-7-8. No risk of under-nutrition or over-fertilization, your plants always receive exactly the right amount of organic fertilizer. BioTabs make your life easier and enable effortless organic growing. The tablets contain slow-acting nitrogen, natural humic acids, beneficial soil bacteria and are 100% organic. Use 1 BioTab per 5 liters of soil and press it in 5-10 cm deep. Different pot sizes require different amounts of tablets.