Soil Aerator is made from recycled glass and is very useful in creating a barrier against fungus gnats / Scarid fly on the top of pots. putting a layer of this media means the adult flys get cut to pieces if they try to lay larvae in the media. To us - it only feels like sandpaper but to an insect the media is like shards of glass. It is similar to course or super course Perlite in size and is mostly grey white in colour.
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