block 130 can be provided to mixers plug wipers bleaching towers and deckers for example hydrogen peroxide addition block 132 can occur at the same injection locations as magnesium oxide hydroxide water slurry injection magnesium oxide hydroxide water slurry injection can occur separately or concurrently with hydrogen peroxide injection if magnesium oxide hydroxide water slurry injection is carried out separately in the primary refiner the hydrogen peroxide can be injected before or after the refiner or at the bleaching tower alternatively hydrogen peroxide injection can take place with the magnesium slurry injection before or at the refiner this manner of magnesium oxide hydroxide water slurry and hydrogen peroxide injection can take place in any other refiner or ancillary vessel either separately or concurrently the amount of magnesium oxide that is used in any one refiner or vessel is about 0 75 to about 2 based on the oven dried weight of the wood and undiluted 100 magnesium oxide the addition of hydrogen peroxide that is used in any one refiner or vessel is about 1 to about 12 based on the oven dried weight of wood and undiluted 100 hydrogen peroxide chelating agents or chelants block 128 may be added to the pulp prior to refining in the primary refiner such as at the plug wiper the amount of chelant added can be about 0 1 to about 0 5 based on the oven dried weight of wood and undiluted 100 chelant suitable chelating agents include but are not limited to.