perlite is a porous substance it offers both excellent water retention and drainage capabilities – both important in hydroponic gardening. Additionally, perlite also provides proper aeration which is necessary for healthy root growth in plants.

Perlite is an inert and sterile medium which means it’s safe to use without the fear of tracking in pests, which is always the risk with soil. Perlite has a neutral pH level but will take on the acidity or alkalinity of the nutrient solution it’s placed in. Perlite can be washed and dried to be restored to its 7.0 pH level.

While perlite is the perfect substrate to re-use by washing, it’s also a medium that will not decompose so it’s guaranteed to last for years.

In terms of plant health, perlite as a grow medium strengthens root growth and also acts as a terrific insulator to protect plants from temperature changes.