LECA stands for light weight expanded clay aggregate. LECA is manufactured in rotary kiln at 1200ËšC. Its dark brown in color with interior black color in round shape. LECA is a versatile material. It is almost used in concrete fillings, construction sites, hydroponics, aquaponics , geo fillings[1] . It was first developed in the year of 1917. LECA can be used effectively in waste water treatment. This paper scrutinizes the use of LECA and modified LECA for the treatment of waste water.
