Multi-Barrier Household Trains Priced per Log: Which Combination Buys Balanced Protection, and Which Expensive Barrier Buys a Lopsided One

SIMULATED, NOT MEASURED. Six household treatment trains are assembled from computed barrier values and priced per limiting-organism log per 1000 L: ceramic+chlorine costs US$0.805, UV+chlorine gives the highest limiting log (4.5), ceramic alone is virus-limited at 0.5 log, and ultrafiltration alone is charged for its unprotected storage. Computation only; nothing was built or field-tested.