Buy a bag of imported Vermiculite by Gulf Perlite LLC. The bag weighs about 8-9 KG and contains 100-liter Vermiculite.
Vermiculite is used to improve water retention, drainage, and aeration of potting media. Compared to Perlite, it provides better water retention while Perlite offers superior aeration. It can be used standalone as sowing media for seeds or in potting mix for general purpose use.
Powdered vermiculite is best for seed germination both as stand-alone potting media or in a potting mix.