Lightweight clay aggregate formed by special clay minerals expanded at a high temperature. This produces ceramic "pebbles" with a smooth outer crust and a honeycomb interior. These pebbles are sterile, non-toxic, inert, resistant to algae, extremely strong and can absorb up to 40% of their own weight in water. They are not damaged by frost and have good insulating properties. Use for oven insulation and drainage at the base of planters.
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