Karrimor hydration cleaning kit this hydration cleaning kit is a must have for serious adventurers hydration bladders require regular cleaning to prevent mould growth and odours any water that is left in the reservoir and hose can be a breeding ground for bacteria this is where this kit comes in handy it can be used to keep your hydration system in top condition hydration system cleaning kit 4 in 1 cleaneer kit flexible stainless steel spring wire food grade pp and stainless