Ingredients like perlite and light expandable clay aggregates (LECA) create air space and porosity when you add them to a potting mix. You can improve drainage by adding our Horti-Perlite and Horti-Clay to a potting mix. Horti-Perlite improves porosity while Horti-Clay improves porosity as well was moisture regulation in the soil to avoid the roots from getting too dry or too wet.