Table 3: Mean concentration, standard deviation (only for THM4), minimum and maximum of the 4 studied THMa ( ), and mean and value of the two samples for MXb and bromatec ( ) before and after the filtration experiments. Percentage of change in bold.

Reverse osmosisActivated carbon pitcher-type filter
1 L 75 L 150 L
Before After Before After After After

Chloroform (TCM)
 Mean (SD)7.3 (0.06)3.21 (0.04)3.46 (0.14)0.31 (0.03)0.70 (0.03)1.17 (0.48)
 Min–max(7.25–7.39)(3.17–3.27)(3.31–3.61)(0.27–0.33)(067–0.74)(0.88–1.89)
 % change −56 −91 −80 −66
Bromodichloromethane (BDCM)
 Mean (SD)15.09 (0.18)0.58 (0.04)8.75 (0.31)0.99 (0.10)1.99 (0.05)2.20 (0.07)
 Min–max(14.94–15.33)(0.56–0.64)(4.48–9.13)(0.88–1.09)(1.92–2.04)(2.12–2.28)
 % change −96 −89 −77 −75
Dibromochloromethane (DBCM)
 Mean (SD)35.48 (0.29)0.10 (0.12)27.25 (0.91)2.82 (0.24)6.15 (0.17)6.67 (0.15)
 Min–max (35.08–35.72)(0.02–0.27)(26.40–28.26)(2.58–3.11)(5.90–6.26)(6.47–6.80)
 % change −99 −90 −77 −75
Bromoform (TBM)
 Mean (SD)69.44 (0.89)0.18 (0.25)64.76 (1.86)6.91 (0.65)16.42 (0.37)16.69 (0.19)
 Min–max(68.71–70.58)(0.03–0.55)(62.68–66.64)(6.37–7.78)(16.15–16.97)(16.53–16.97)
 % change −99 −89 −75 −74
Sum of 4 THMs (THM4)
 Mean (SD)127.31 (0.87)4.07 (0.41)104.23 (3.18)11.04 (1.00)25.26 (0.56)26.74 (0.72)
 Min–max(126.64–128.59)(3.82–4.68)(101.07–107.64)(10.20–12.31)(24.64–26.01)(26.00–27.65)
 % change −97 −89 −76 −74
MX
 Mean 0.8<0.50.6<0.5<0.5<0.5
 Min–max(0.7–0.8)(all < 0.5)(0.5–0.6)(all < 0.5) (all < 0.5) (all < 0.5)
 % change*
Bromate
 Mean2.30.52.902.63.102.55
 Min–max (2.2–2.4)(all <0.5)*(2.9-2.9) (2.3–2.8)(2.8–3.4)(2.5–2.6)
 % change −12 7 −12

THM4 and all 4 species: concentration in g/L, limit of quantification of 0.4  g/L, all means .
bMX: concentration in ng/L, limit of quantification of 0.5 ng/L, all means .
cBromate: concentration in g/L, limit of quantification of 0.5  g/L, all means .
*Percentages of change when values were under the limit of quantification (LOQ) for MX and bromate are not reported due to high uncertainty in the estimate.