Table 2. Mean Concentrations of RO Feeds and RO Concentrates (c) from the Robustness Tests.

	β Cr(III) (g/L)	β B(OH)3 (g/L)	β SO42– (g/L)
feed (1:10)	0.86 ± 0.02	8.05 ± 0.10	13.41 ± 0.04
feed (1:7.5)	1.13 ± 0.00	14.72 ± 0.20	16.01 ± 0.20
feed (1:5)	1.64 ± 0.04	13.83 ± 0.19	23.25 ± 0.52
conc. 1	6.26 ± 0.51	31.30 ± 0.51	87.19 ± 7.79
conc. 2	6.77 ± 0.26	39.22 ± 1.72	92.97 ± 3.36
conc. 3	6.26 ± 0.35	39.67 ± 2.34	86.02 ± 4.73