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4. Checking the water hardness
A properly functioning water softener is crucial for
the efficiency and longevity of the Selcoperm
system. High levels of calcium carbonate in the
electrolyte lead to a visible precipitation on the
electrodes of electrolyser cell.
The water hardness test is a drop test. The hardness
is determined by counting the drops of reagent, until
the colour changes.
4.1 Water hardness test procedure
1. Take a sample from the soft water sample valve
at the Selcoperm system. See Selcoperm
installation and operating instructions.
2. Fill the sampling container (Fig. 1, Pos. 7) to the
5 ml mark.
3. Hold the reagent bottle vertically. Add the reagent
drop by drop while swivelling the sample
carefully, until its colour turns from red to green.
– Count the number of drops. One drop equates
to one degree of total water hardness.
4.2 Result
•
If the sample turns green with one drop of
reagent, the water is soft.
– The water softener is functioning properly.
•
If the sample turns red and requires more than
one drop to turn green, the water is not soft.
– The water softener needs regeneration or the
resin beads must be replaced.
4.3 Conversion of water hardness
°d
°e
°f
1
1.3
1.8
2
2.5
3.6
3
3.8
5.4
4
5.0
7.1
5
6.3
8.9
6
7.5
10.7
7
8.8
12.5
8
10.0
14.3
9
11.3
16.1
10
12.5
17.8
8
mg/l
mg/l
mmol/l
CaO
CaCO
3
10
18
0.18
20
36
0.36
30
54
0.54
40
71
0.71
50
89
0.89
60
107
1.07
70
125
1.25
80
143
1.43
90
161
1.61
100
178
1.78
5. Checking the specific gravity (SG)
of the electrolyte
SG is the specific gravity of the electrolyte entering
the electrolyser cell. See Selcoperm installation and
operating instructions.
5.1 SG test procedure
1. Flush a clean and dry measuring cylinder (Fig. 1,
Pos. 1) with electrolyte from the electrolyte
sample valve.
2. Fill the measuring cylinder with a sample from the
electrolyte sample valve.
3. Place the hydrometer (Fig. 1, Pos. 3) in the
measuring cylinder.
4. Take the reading from the hydrometer.
6. Checking the temperature of the
NaClO solution
1. Take a sample from the NaClO solution sample
valve at the Selcoperm system.
2. Place the thermometer (Fig. 1, Pos. 11) in the
sample and take the reading.
– The temperature should not exceed 40 °C.
7. Spare parts
Description
Hydrometer
Thermometer
Stirring rod
Dispenser tip, 5 pcs
Total hardness test kit
Set of 100 Acidifying GP tablets
and 100 Chlorine HR tablets
Set of 30 ml titrant (2N sodium
thiosulphate solution (Na
and dispenser tip
8. Disposal
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest
Grundfos company or service workshop.
The used analysis sample can be flushed down the
drain with tap water. Unused, expired reagent must
be disposed of according to local regulations.
See also end-of-life information at
www.grundfos.com/product-recycling.
Product
number
98504212
98708063
95727771
99619798
98948745
98144705
S
O
))
99619819
2
2
3
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