IBC Water AS30400, Installation & Operating Instructions Manual

Page: 6 / 28

Page 6
EXAMPLE
Unit AS30400
Litres of resin “400” from Table 4
Hardness of water 90 mg/l
Flow 15kl/hr for 18 hours /day.
Q = 15 x 18 = 270 kl/day
H = 90 mg/l or ppm
C = 24300 grams (= 270 x 90)
Frequency of regeneration -
C
N = -------------
H x Q
24300
= -------------
90 x 270
= 1.0 day
Always go down to the nearest whole number (say 1 day).
Total hardness removed -
A = N x H x Q
= 1 x 90 x 270
= 24300 grams
The medium and maximum capacities of a single unit from Table 4 are 21000 and 28000
respectively. The calculated capacity falls closer to the maximum and so the higher value
should be used.
Salt dosage required per single softener for 28000 g is 96 kg (from Table 4).
Now looking at Table 5 we find that only wet salt can be used. However, if your calculated
salt dosage allows you the choice of either dry or wet salt always choose dry salt.
In the case of the example the salt dosage is 96 kg so the float setting is 350mm (refer Brine
Tank Set-up for float setting details), brine tank size is 1070 x 1220.
Install the brine valve as shown in Brine Tank Set-up.
The initial salt load as shown in Table 7 should be loaded into the brine tank.