Lechuza PON- the key to the Lechuza self-watering system is a specially formulated granular plant substrate. It seperates your potting soil from the reservoir, aerates the roots and helps regulate water supplied to your plant. And provides your plants with 6 months of nutrition. Features: PON 12 liters bag capacity. Helps regulate water supplied to your plant. Perfect planting medium for indoor houseplants. Contains slow release fertilizer for balanced plant growth. Contains pumice, zeolites, lava and slow release fertilizer. Made in Germany. Dimensions: 12L. Material(s): plastic