We use Camelbacks all the time. To keep it clean, I have a 2 fold system. First, we store them in the freezer in a ziplock bag.. It prevents mold growth. When you are done using it, rinse it out with hot water and let it drain through the hose. Every month or so, I use denture tabs to clean them. Just throw 2 tabs in the bladder and fill it with warm water. Make sure you get the water with the dissolved tab into the hose. Let it sit for a few hours. Drain and rinse. Then back in the freezer. I have been doing this for years and have not had any issues.