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Installer Manual Fleck 5812 - XTR - System sizing
4.2.3. Resin exchange capacity and capacity of the unit
The resin exchange capacity and capacity of the unit are two different things that should not be
confused. The resin exchange capacity is the amount of Ca
of resin, which will depend on the resin type and salt dosage, whereas the capacity of the unit is the
capacity of the system, which will depend on the volume of resin and resin exchange capacity.
Knowing the required volume of resin, you can determine the exchange capacity of the unit. The
capacity of the unit can be expressed in different ways:
•
the mass capacity, which corresponds to the weight in equivalent CaCO
resin, expressed in kg as CaCO
•
the volume capacity, which represents the maximum amount of water that can be treated
between two regenerations. This last capacity takes into account the hardness of the water to be
treated and is expressed in m
•
the combined capacity, which represents the volume of water that could be treated between two
regenerations if the inlet hardness is 1 °f or °dH. This capacity is expressed in °f.m
The resin exchange capacity will depend on the amount of salt to be injected into the resin bed during
the regeneration. This amount of salt is given in grams per litre of resin. The next table is showing the
resin exchange capacity in function of the amount of salt for a system with standard efficiency
regeneration.
Resin exchange capacity as a function of the salt dosage:
Salt amount
[g/L
resin]
50
60
70
80
90
100
110
120
130
140
150
34 / 132
;
3
3
or litres;
Corresponding resin exchange
capacity in [g/L
] as CaCO
resin
29.9
34
37.5
40.6
43.4
45.9
48.2
50.2
52.1
53.8
55.5
2+
2+
and Mg
that can be retained by 1 litre
that can be fixed on the
3
3
°f.m
[per L
]
3
resin
2.99
3.4
3.75
4.06
4.34
4.59
4.82
5.02
5.21
5.38
5.55
Ref. MKT-IM-019 / E - 14.10.2019
3
3
or °dH.m
.
3
°dH.m
[per L
]
resin
1.67
1.9
2.09
2.27
2.42
2.56
2.69
2.8
2.91
3.01
3.1
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