Perlite has been used for decades in insulation, cement, and building materials, but recently has been used more and more for things like filtering and as a growing substrate. Many hydroponicists use perlite as their primary medium (especially if they’re growing in Bato or Dutch buckets).
That being said, there are both pros and cons to using perlite in hydroponics. Growers should choose a medium based on how much it weighs, how easy it is to handle, how it impacts system pH and diseases, the size or texture, etc.
Pros of perlite
- Perlite is usually reusable.
- Perlite helps deal with anaerobic conditions.
- Perlite is inexpensive.
- Sterile and pH neutral
- Perlite ore is not a renewable resource.
- Aggressive root systems can cause blockage.
- Vulnerable to solids loading
- Dust hurts fish and can be hazardous if inhaled.
Read the Upstart University article to learn more about these pros and cons.
