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Softeners: calculate brine wash run times

Softeners: calculate brine wash run times

Softeners: calculate brine wash run times

(OP)
Can someone tell me how to calculate brine wash run times for ion exchange filters?  I can figure how much brine I need, but how do you know the rate (gpm) or the time in minutes?  Of course if I had one I could figure the other.  I have the same question for the slow rinse and fast rinse stages.  FYI: I'm using counter-current backwash for the filter.

Thanks for the help!

RE: Softeners: calculate brine wash run times

It depends upon what type of resin you are using.  If it is a standard softening resin with standard gaussian distribution beads the following are your answers:

Brine Draw -  2 - 7 BV/hr (0.25 - 0.9 gpm/ft3 of resin)15 to 60 minutes depending upon salt dose.
Slow Rinse - Same  Approximately 30 minutes or until salt concentration has dropped to 0%.
Fast Rinse - 8-40 BV/hr (1 - 5 gpm/ft3  5 to 30 minutes.

All backwashing is counter-current (up flow).  I assume you don't mean that the Brine Draw and Slow rinse are counter-current.  

Gary Schreiber, CWS VI
The Purolite Co.

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