The HALO Ultra Plus is a zero-electricity reverse osmosis system that purifies municipal or well water by removing contaminants like PFAS, lead, arsenic, fluoride, and chromium through a four-stage filtration process (sediment filter, carbon block, 50-gallon-per-day membrane, and alkalinity pH booster). The system features a smart faucet that indicates when filters need changing, a 4.5-gallon storage tank, leak detection, and tool-free filter replacement, while achieving a 1:1 water purification ratio. It produces alkaline drinking water and addresses numerous specific contaminants including heavy metals, radium, selenium, turbidity, and total dissolved solids.