Table 4.

FUN/BUN ratio of filters with and without compromised filter function

Periods of Filter Use (12-hour periods)Normal Filter Function GroupCompromised Filter Function Group
Number of Filters in UseFUN/BUN RatioNumber of Filters in UseFUN/BUN Ratio
1781531
2691 (0.93 to 1.03)420.99 (0.87 to 1.00)
3731 (0.94 to 1.03)371 (0.86 to 1.00)
4681 (0.95 to 1.07)330.98 (0.91 to 1.01)
5521 (0.93 to 1.04)250.97 (0.85 to 1.00)
6460.99 (0.94 to 1.03)220.94 (0.90 to 0.99)
7261 (0.94 to 1.04)130.85 (0.81 to 0.96)
  • Median FUN/BUN ratio of filters across 12-hour consecutive periods of filter use grouped by filter function and the number of filters that were in use at each time point (period 1 = 131, period 2 = 111, period 3 = 110, period 4 = 101, period 5 = 77, period 6 = 68, period 7 = 39).