L.E.C.A stands for Light Expanded Clay Aggregate. L.E.C.A. is formed into rounded clay pellets by baking pure natural clay at a temperature of 1200 degrees Celsius for 3 hours in a kiln.
Light expanded clay aggregate, also commonly referred to as "grow rock", is ideal for indoor hydroponic growth because of its neutral properties - L.E.C.A. has no acid or alkaline characteristics. Hydroponics gardeners appreciate the neutrality of L.E.C.A. because so many are aware how difficult it is to maintain a perfect alkaline/acidic balance in soil gardening.
Because L.E.C.A. comes in the form of lightweight pebbles, nutrients are carried to the plant's roots on a continuous basis. Although continuous saturation of plant roots typically results in root rot, L.E.A.C. eliminates the root rot threat because of the distribution of the pebbles - which allows adequate space and oxygen between the L.E.C.A. pebbles and the plant's roots.
Although light expanded clay aggregate is typically more expensive then the other popular grow media - such as rockwool, coconut fiber or perlite and vermiculite - clay aggregate pellets are one of the only growing medium that can be cleaned and reused repeatedly after each hydroponic growing season.
Light expanded clay aggregate pellets can be purchased online for the following prices: