The Clear2O RV 2 IN 1 Dual Filtration Replacement Water Filter combines both a pre-filter stage and a solid carbon stage in one filter, for longer life and improved performance. Effectively filters water throughout your RV; blocking sediment, dirt, and reducing heavy metals, chlorine, hydrogen sulfide and other harsh chemicals that can cause bad taste and odor in your water. The first stage (10 micron pre-filter) is the first line of defense to block particulates and the second stage (5 micron solid carbon block) will reduce bad taste and odors in your water. When camping, water is necessary for drinking, rinsing, cooking, and showering the water Clear2O RV 2 IN 1 Dual Filtration Replacement Water Filter blocks sediment out of your RV water tank and to improves the taste and odor of your drinking water.