A Post-Disaster Drinking-Water Triage Kit for the First 72 Hours: Staged Treatment, Computed Log Removal, Gravity Throughput and a Priced Verdict

Design of a family/clinic-scale post-disaster drinking-water triage kit (settling/cloth, gravity ultrafiltration, chlorine) sized from first principles: pathogen log removal by stage, gravity throughput, membrane fouling by turbidity class, chlorine demand versus organic load, and mass/volume/cost budget. On moderate (50 NTU) water it computes to 56.36 L/day, 33.15 L/day/kg and 0.972 L of safe water per dollar per day at $58.00 and 1.70 kg; on extreme (500 NTU) water chlorine demand exhausts the dose, virus removal falls to 2.0 log against a 4.0-log target, and safe output is zero. SIMULATED, NOT MEASURED.