Orku 100L Coarse Perlite Soil Additive - Drainage Aeration Growing Medium BulkOrku Coarse Perlite is a lightweight, expanded volcanic mineral used to improve aeration and drainage in potting mixes and growing media. Its porous structure helps reduce soil compaction, increase airflow to roots, and allow excess water to drain efficiently. This 100 litre bulk bag is perfect for creating your own potting mix or raised bed mix in bulk. Ideal for cacti, succulents, orchids, and other plants that require well draining conditions.