I made a guide a few weeks ago, here it is
LECA is expanded clay balls. Similar to pumice for example, it has a lot of pores, which draw up water by capillary action. It is constantly moist, but also highly aerated and my hydroponic medium of choice.
I also made a few posts about it, including microscope pictures and explaining the concept of semi-hydro :)
cybervseas@lemmy.world 1 week ago
Lightweight Expanded Clay Aggregate. Basically totally inert pebbles that are very light and will retain a little water and draw a tiny bit up through capillary action. Used instead of soil for hydro and semi hydro growing.
stringere@sh.itjust.works 1 week ago
Thank you. I’d heard/read it before and forgot. Coulda googled but conversationally obtained information tends to stick better for me.