Description: Crushed Lava Rock A porous, mineral-based substrate that improves drainage, aeration and filtration while adding structure to a growing medium. Its weight also makes it useful in applications where lighter materials like LECA may float or shift.

Available in 1L sizes.  

Rays Says: "Use it in aroid mixes for extra drainage and airflow, as a filtration or drainage layer, or as a decorative top layer. It also works well in paludariums as a heavier alternative to LECA because it sinks and stays in place."