The invention relates to a method for the removal of uranium species from waters by means of weakly basic, polyacrylic-based anion exchangers, said uranium species being present in the form of uranyl complexes as dissolved uranyl. The compositions are formulated for immediate release, controlled release, or both immediate and controlled release. The frame also carries a pair of rear wheels that are rotationally mounted to the frame via a pair of rear pivotal wheel support assemblies.