ZeroWater is a, now Culligan-owned, water filtration system that uses a patented 5-stage filter to remove 99.6% of Total Dissolved Solids (TDS) from tap water, aiming for a "000" reading on the included TDS meter. It removes contaminants like lead, chromium, PFAS, fluoride, and mercury, offering purification comparable to reverse osmosis or distillation.