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Hydroponics
Growstones are made from recycled glass from landfills or glass collecting & processing places. 
Growstones 
Some people may worry that they can get cut from this medium because they are made from glass. Don't get worried about that because these recycled glass has been hardly crushed, melt, sometimes mixed in some calcium carbonates.
This medium is very lightweight, highly porous and above all, it has great air aeration,
and average moisture retention 
to the root system.
and average moisture retention to the root system.
You should start by washing and rinse the medium thoroughly to remove small particles, and dust. The medium is ideal for using alone or for mixing into peat, coco coir 
and other growing media.
Benefits 
Lightweight Good air to water ratio Sustainable
Downsides 
Cling to some roots, which can cause root damage for some plant types. A little bit of dust. More expensive than other media.
