Pumice 2 L
It's used for bonsai soil loosening and known as keiseki as well. The medium is vulcanic and have neutral ph. It's commonly used for bonsai and orchid soil mixtures. The pumice makes the potting soil aerier and looser, which helps the healthy growth of the roots. If you use this substance in the mixture, you can prevent rootrotting. Pumice is used for five-needle pines and Paphiopedilum orchids. It's also well known in the akvarist world, because it's an excellent biological filter substance.
The pack contains 2 L of pumice.