Does a free trial approach increase purchase and use of the water purification product Klorfasil in rural Haiti?

INTERVENTION: We enrolled households from villages in Thomassique, Haiti, to evaluate purchase and water treatment outcomes over 6‐months of follow‐up. Clusters of households were randomized to free trial (intervention) or cost‐sharing group (control). Households were surveyed and informed of the importance of treating their water and then offered to purchase Klorfasil. Households in the intervention group were given 30 days free use of Klorfasil before deciding to purchase. Households that purchased Klorfasil were followed up 30, 60, and 180 days after baseline survey. CONDITION: Water purification using chlorination to prevent diarrhea ; Infections and Infestations ; Infectious diarrhea PRIMARY OUTCOME: Decision to purchase Klorfasil at baseline and 180 days SECONDARY OUTCOME: Residual free chlorine (RFC) levels of stored drinking water at baseline and 30, 60, and 180 days after baseline. Water with RFC levels of 0.5 mg/l and above is deemed "treated" while water with RFC<0.5 mg/l is deemed "untreated" INCLUSION CRITERIA: 1. Aged 18 years and over 2. Never used Klorfasil or another household water treatment product before (with the exception of Aquatabs)