Agricultural Perlite Stone Essential in mixing any soil Weight// 5 Liters Price// 10 Riyals It is essentially volcanic rock that has been heated until it expanded and became lightweight, brittle, and very suitable for mixing with any soil. For indoor and outdoor plants and terrariums 1- It helps with aeration and water drainage 2- It helps with soil fertility and moisture retention, as it stores water and nutrients inside And then gradually releases them when the soil begins to dry out.