Lightweight expanded clay aggregate (LECA) pebbles designed for hydroponic systems, aquaponics, and indoor gardening. These inert, pH-neutral pellets provide excellent drainage and aeration for plant roots while promoting healthy growth in soil-less environments. The 4 lb bag is ideal for small to medium setups, seed starting, or refreshing existing systems. Reusable and long-lasting—simply rinse and sterilize between growing cycles. Perfect for houseplants, herbs, vegetables, and ornamental plants in hydroponic or semi-hydroponic containers.