Perlite is the go-to for whenever you need to improve aeration and drainage in your potting mixes. This makes it the perfect addition to houseplant compost, as the extra air will help prevent root rot, every indoor junglists enemy.
It also comes in very handy when propagating cuttings and sowing seeds for the same reasons.
BetterGrow Perlite is made from naturally occurring volcanic rock which is then heated to a high temperature to produce a lightweight, micro-porous structured substrate.
Available in both 3 litre and 8 litre bags.