Provides a Formulation in the form of Solid Particles comprising soluble FERRIC PYROPHOSPHATE and a bag which comprises the formulation in the form of Solid Particles of FERRIC PYROPHOSPHATESoluble in addition to a Dialysis Solution.Also disclosed are Improved methods for Administering soluble FERRIC PYROPHOSPHATE formulations comprising Solid Particles and Kits comprising the formulation in the form of ParticleS Solid and concentrated Formulation for dialysis.Se proporciona una formulacion en forma de particulas solidas que comprende pirofosfato ferrico soluble y una bolsita que comprende la formulacion en forma de particulas solidas de pirofosfato ferrico soluble para su adicion a una solucion de dialisis. Tambien se divulgan metodos mejorados para administrar pirofosfato ferrico soluble que comprende las formulaciones de particulas solidas y los kits que comprenden la formulacion en forma de particulas solidas y una formulacion de concentrado para dialisis.