What are the beads this guy is scooping out in this video: https://www.youtube.com/embed/3Gjd5DRyeks


That look like Hydroton, which explained above is expanded clay.

It is highly porous and holds moisture very well, and is used in a lot of Deep Water Culture/Aquaponic/Hydroponic applications.

  • 1
    That's a lot cheaper than the previous answer. – black thumb Mar 20 '16 at 22:53
  • If you are looking for economic solutions, you might also look into expanded shale and growstones, but I've never used them personally. – DevOops Mar 20 '16 at 22:56
  • 1
    It's for a hack-a-thon project, so we're shoe stringing the project. – black thumb Mar 20 '16 at 23:00
  • Cool, are you guys doing anything code related? What is your objective? Is there a project page? Good luck with it – DevOops Mar 20 '16 at 23:07
  • 1
    I am (slowly) working on a pH/Nutrient controller with Raspi. Interested in similar type projects and how they're executed. – DevOops Mar 20 '16 at 23:21

These are called by various names but the one I am familiar with is LECA. It stands for Lightweight Expanded Clay aggregate and is made by this company.

Having seen this material used in twenty and thirty year old installations I can attest to its durability. Lightweight? Not so much.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.