For the microgel charge distributions ρ X (r) = 3q X Θ(a -r)/(4πa 3 ), with the Heaviside step function Θ(r), we explicitly compute the microion density profiles within the mean-field approximation (Poisson-Boltzmann theory). Assuming the cell to be grand-canonically coupled to a microion reservoir of added salt concentration c res salt and pH-value pH res , the reservoir microion concentration is given by