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Table 1 Performance Indicators for Fluoridation plants in Community Y and Community X

From: Feasibility and costs of water fluoridation in remote Australian Aboriginal communities

Overall Plant Performance Community X Community Y
Number of days in trial 708 758
Number of days of operation with functioning probes (as a percentage of total number of days)* 247 (35%) 393 (52%)
Number of days of operation with malfunctioning probes (as a percentage of total number of days)* 318 (45%) 236 (31%)
Number of days plant not operational (as a percentage of total number of days) 143 (20%) 129 (17%)
Number of days fluoride estimated to be within recommended range (0.6 mg/L +/-0.1)* 198 (28%) 19 (3%)
Number of days fluoride < 0.6 mg/L * 54 (8%) 19 (3%)
Number of days fluoride > 1.0 mg/L 0 1 (identified by field testing)
Number. of plant shutdowns 3 3
Number of times fluoride > 1.0 mg/L caused a plant shutdown 0 (Community X was shut down as a precautionary measure following a high reading in Community Y) 1
Reasons for plant shutdowns ■ Faulty probe readings detected by field testing
■ Probe replacement
■ Fluoride accumulating on the base of the tank
■ Faulty probe readings detected by field testing.
■ Probe replacement
Reasons for fluoride levels falling outside specified range ■ Faulty probe readings ■ Faulty probe readings
  1. * Values and percentages based on reported values and interpolations where data were missing for 10 days or less.