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Soilsouls compressed coir bricks have no added chemicals or added chemical fertilizers. The coir expands up to seven times in volume when water is added so small pieces can be used at a time. The coir is a handy supplement to a wormfarm – it adds natural food and bedding and is a good back-up when the bins becomes a bit anaerobic or acidic or compacted. Only add to the top tray.