Perlite is a pure, single-ingredient soil improver: lightens any mix and stops it compacting over time. It is meant for improving drainage in almost every potting soil. Sybotanica sifts and grades every batch, so what is in the bag is consistent every single time. Use it on its own or blend it into your own mix. One clean ingredient, no fillers and nothing added Graded and sifted for a consistent particle size Mix it your way, or use it as a layer on its own Resealable bag that keeps the rest dry The building blocks serious plant people use to build a substrate that fits their own conditions.