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4
System sizing
4.1
Recommended Injector/DLFC/BLFC-Valve configuration
Brine
Tank
syst.
Diameter
[in]
2750/
10
1600
12
14
2750/
16
1700
21
24
30
4.2
Sizing a softener (single unit)
4.2.1
Parameters to be considered
Whenever installing a softener, it is preferable to have full water analysis to ensure the inlet water
content will not affect the resin bed.
Tip
Please consult your resin manufacturer specification !
To ensure that no additional pretreatment prior to softening is required.
The below sizing method can be applied for both residential and industrial softeners.
The sizing of a softener must be based upon certain parameters:
• inlet water hardness;
• peak flow rate and nominal flow rate;
• service velocity;
• salt dosage.
The softening and regeneration reactions are driven under certain conditions. To allow these
reactions to take place, make sure that the velocity is convenient during the different phases for
proper ion exchange. This velocity is given in the resin manufacturer specifications sheet.
Depending on the inlet water hardness, the service velocity for standard softening must be
between:
Service velocity
[bed volume per hour]
8 - 40
8 - 30
8 - 20
Ref. MKT-IM-026 / C - 15.12.2020
Resin
volume
L
DF
Color
35 – 42
1
White
43 – 56
2
Blue
57 - 85
3
Yellow
83 – 113
3C
Yellow
114 – 198
4C
Green
199 - 283
284 - 425
5C
White
Inlet water hardness
Installer manual Fleck 2750 NXT/NXT2 - System sizing
Injector
UF
Color
N/A
N/A
[mg/l as CaCO
]
3
<350
350 to 450
>450
DLFC
BLFC
[gpm]
DF [gpm] UF [gpm]
2.4
0.50
3.5
5.0
1.0
7.0
1.2
10.0
2.0
15.0
25.0
4.0
°f
°TH
<35
35 - 45
19.6 - 25.2
>45
N/A
°dH
<19.6
>25.2
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