Perlite

Searles Perlite

Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently.

In horticulture perlite can be used as a soil amendment or alone as a medium for hydroponics or for starting cuttings. When used as an amendment it helps prevent water loss and soil compaction.

Perlite is an excellent filter aid. It is used extensively in Australia and New Zealand as an alternative to diatomaceous earth. The popularity of Perlite usage in this application is growing considerably worldwide.