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You can safely add this pumice stone / lava rock to your shopping cart! It has many advantages. It is ideal as a soil improver or to decorate your terrarium. Pumice or lava rock has a high PH content, is breathable and permeable to water. It helps with drainage as well as water retention. So it can be your lifesaver and prevent root rot. This is the kind of substrate you really want. Experiment with it and find out for yourself what these little stones can do!