Installer manual Fleck 2850 SXT - System sizing
Ref. MKT-IM-030 / C - 12.05.2020 27 / 104
4 System sizing
4.1 Recommended Injector/DLFC/BLFC-Valve configuration
Brine
syst.
Tank
Diameter
Resin
volume
Injector DLFC BLFC
[in] L DF Color UF Color [gpm] DF [gpm] UF [gpm]
2850/
1600
10 35 – 42 1 White N/A N/A 2.4 0.50 N/A
12 43 – 56 2 Blue 3.5
14 57 - 85 3 Yellow 5.0 1.0
2850/
1700
16 86 – 113 3C 7.0 1.2
21 114 – 198 4C Green 10.0 2.0
24 199 - 283 15.0
30 284 - 425 5C White 25.0 4.0
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]
Inlet water hardness
[mg/l as CaCO
3
]
°f
°TH
°dH
8 - 40 <350 <35 <19.6
8 - 30 350 to 450 35 - 45 19.6 - 25.2
8 - 20 >450 >45 >25.2
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