Sodium silicate (water glass) is a commodity product used to enhance peroxide bleaching of mechanical pulps. It is relatively cost-effective, rather easy to apply and universally available. With regard to peroxide stabilization, surface passivation and metal ion sequestration are the most important functions. Although silicate is beneficial in peroxide bleaching, it may generate serious detrimental effects in the pulp and paper making processes. Silicate may also cause deposits on the paper machine and it makes the paper making system more anionic, which leads to a higher consumption of wet-end chemicals. Hence, there is a strong demand for silicate-free peroxide stabilizers in order to avoid the problems described. The use of organic polymers as stabilizers in peroxide bleaching has been studied since the 1950s. Results from a commercial-scale mill trial where silicate was replaced with a silicate-free bleaching concept, leading to significant energy savings, are presented.