This method of treatment is implemented in boilers having operating pressure within 20Kgscm2 where soft & raw water are used as boiler feed water. The above treatment should be used in conjunction with polymeric sludge conditioners for better results. In this method of treatment precipitation of calcium & magnesium, either partially or completely, are induced by maintaining higher pH & higher alkalinity. The residual hardness, if present, should be controlled with the addition of polymeric sludge conditioners.