Selecting a water filtration system for an immunocompromised individual requires careful consideration. Options include Reverse Osmosis (RO) and Ultrafiltration (UF) systems, which effectively remove contaminants like bacteria and viruses. Activated carbon filters target chlorine and heavy metals, while UV purifiers disinfect water by deactivating pathogens. Whole house systems ensure clean water throughout, while point-of-use filters offer targeted solutions. Factors such as filtration level, maintenance, and costs should guide the choice. Consulting water quality experts or healthcare professionals can help make the best decision.