MODEL F73（17603）
28
Up-flow regeneration: T4=0.34×V
R
÷Brine refill speed
In this formula, V
R
——Resin volume (m
3
).
The Brine refill speed is related to inlet water pressure. It is
suggested to lengthen 1~2 minutes of calculated brine refilling time to
make sure there is enough water in tank. （The condition is that the there
is a level controller installed in the brine tank）
⑤ Fast rinse time T5
T5=12×H
R
（min.）
Generally, the water for fast rinse is 3～6 times of resin volume. It is
suggested to be set 10～16 minutes, but subject to the outlet water
reaching the requirement.
⑥ Exchange factor
Exchange factor = E/(k×1000)
In this formula, E——Resin working exchange capability（mol/m
3
）， it is
related to the quality of resin. Down-flow regeneration, take
800～900. Up-flow regeneration, take 900～1200.
K——Security factor, always take 1.2 ～ 2, it is related to the
hardness of inlet water: the higher the hardness is, the bigger the K
is.
⑦ Set up interval backwash times (Only for Mode A-11, A-13)
When the turbidity of raw water is higher, the interval backwash time
could be set F-00. That is, backwash in each regeneration; when the
turbidity is lower, the interval backwash time could be set F-01 (Or other
number value), it is to say that backwash in every two regeneration.
Thus, Standby → Fast Rinse → Brine & Slow rinse → Brine refill →
Standby → Fast rinse → Backwash →Brine & slow rinse → Brine refill →
Standby.
The calculation of parameters for each step is only for reference, the
actual proper time will be determined after adjusting by water exchanger
supplier. This calculation procedure of softener is only for industrial
application; it is not suitable for small softener in residential application.
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