A method for making water-absorbing polymer particles is provided and consists of providing crosslinkers, polymerizable monomers and inorganic solid particles. The average closest distance between two neighboring crosslinkers (RXL) in a water-absorbing polymer particle for a specific X-load of the water-absorbing polymer particle is calculated via the formula below: Rxl=rho_dry+x_Lrho_liqNA⋅∑iw−xliMr_CXLi13 with x_L being the amount of liquid absorbed in the water-absorbing polymer particle in g liq/g water-absorbing polymer particle,rho_liq being the density at room temperature of the fluid that swells the water-absorbing polymer particle (generally saline of 0.9%w NaCl) in g/cm3,rho_dry being the true density of the dry water-absorbing polymer particle in g/cm3,Mr_CXL being the molar mass of the crosslinkers in g/mol,w_xl being the weight ratio of crosslinkers in dry water-absorbing polymer particle,NA being the Avogadro's number in mol-1.
