This will be the third set of Brushes I've gone through due to rusting around the base of the shaft where the rode attaches/screws into the Brush Head. The Simple Human return process (5+ days to California, and a 5+ day turnaround) leaves much to be desired. Simple Human, "simply" uses low quality stainless steel on the shaft of the rod leading to rusting where there is water contact. I have gone through several trials and precautions with each set of Brushes (no harsh cleaning chemicals used, items not left in standing water etc.) to eliminate User Error or Self Inflicted product damage.

 It's apparent that this is a serious manufacturing flaw in which the metal/ materials involved need to be re-examined especially in this situation where water applications come into play. Simple Humans
engineers/designs outstanding products, however the robustness of them is surely questionable.