Not only the builder of Kochi is using m-sad for construction but also the builders association of Kerala are also encouraging the use of m-sand for any kind of construction and even for plastering purpose.
Even I heard that the builders association are directed all the construction to be done with the help of m-sand, and they are limiting the use of river sand only for plastering.
Actually the decision was taken as the Supreme Court has directed to limit the use of river sand for the construction purpose. And several state governments have restricted the excavation of river sand.