As per the Nepal standard guidelines the water storage tank is paid due attention with highest weight in its class and is released only after passing through extensive lab tests .
Black layer: Black layer is the most essential layer for any water storage tank.It safeguards tank from harmful UV rays of sun which ensures long-life of the tank.
Blue layer: This is the layer which remains in contact with water so it needs to be hygienic and pure.So we use only virgin granules in Dakshinkali.