It is recommended that you clean your CamelBak™ Hydration System reservoir regularly. With the CamelBak Cleaning Kit you will have the tools to do the job right. The Cleaning tablets dissolve to remove residue and foul tastes. You can also physically remove contaminants with the included brushes one large brush for the reservoir and a small brush for the tube. A reservoir dryer helps you dry everything out. CamelBak Item# 90638