L.E.C.A. is often the growing medium of choice of novices and professionals alike because it is easy to use. Perlite Perlite is primarily composed of minerals subjected to intense heat which expand and become very absorbent. This material is light, has a neutral pH, excellent wicking action, and is very porous. Perl ite is used in a wide variety of hydroponic systems because of its ability to hold moisture and nutrients as well as air, and also because it is very easy to use. Coconut fiber can also be added into soil mixtures to increase water holding capacity.
Coconut fiber holds more oxygen than rockwool and is pH neutral.
Available as compressed bricks, when Coconut fiber is soaked in water it expands to 6 times its compressed size.