Table 3.

Data on the membrane area covered with scale deposits [27].

All tested membranes	N	$\stackrel{-}{\mathrm{X}}$, %	$\mathrm{S}$, %
	48	23.45	9.63
Groups	${\mathrm{n}}_{\mathrm{j}}$	${\stackrel{-}{\mathrm{X}}}_{\mathrm{j}}$, %	${\mathrm{S}}_{\mathrm{j}}$, %
Effects of magnetic treatment of solution
$\mathrm{j}=1$, exposed to magnetic field	24	24.81	8.34
$\mathrm{j}=2$, not exposed to magnetic field	24	22.09	10.78
F-test	$\mathrm{F}$	${\mathrm{F}}_{\mathsf{\alpha }},\mathsf{\alpha }=0.05$	$\mathrm{p}$
	0.95	4.05	0.33
Effects of additional 3048 cm (100 ft) coiled tubing
$\mathrm{j}=1$, without 100 ft coiled tubing	16	21.54	4.71
$\mathrm{j}=2$, with 100 ft coiled tubing	32	24.40	11.28
F-test	$\mathrm{F}$	${\mathrm{F}}_{\mathsf{\alpha }},\mathsf{\alpha }=0.05$	$\mathrm{p}$
	0.94	4.05	0.34
Effects of feed flow rates
$\mathrm{j}=1$, Q = 10 mL/min	14	30.83	113.44
$\mathrm{j}=2$, Q = 15 mL/min	8	20.50	32.94
$\mathrm{j}=3,$ Q = 20 mL/min	10	21.12	108.29
$\mathrm{j}=4$, Q = 25 mL/min	6	21.40	16.11
F-test	$\mathrm{F}$	${\mathrm{F}}_{\mathsf{\alpha }},\mathsf{\alpha }=0.05$	$\mathrm{p}$
	3.53	2.88	0.025