The Halsey Taylor water filter provides cleaner, healthier drinking water, and are made of activated carbon. The Hydroboost filter, the 55898C, is used on bottle filling stations. The 55897C water fountain filter reduces contaminants such as lead and is a self-contained cartridge. A water filter kit, like the HWF172, HWF3000, and the HWF142, converts your existing Halsey Taylor water fountain or bottle filler into a filtered unit.