Recommendations on how to set up a demineralizer system.
SEPARATE BED UNITS
*This becomes 3-4 gpm/sq.ft. for Type 2
**Rinse volume is dependent upon effluent quality desired at start of service run. Use the following values for usual design conditions:
Regeneration flow rates and times should be obtained from separate data for individual resins.
MIXED BED UNITS
Service rate, normal 15 gpm/sq.ft.
Service rate, maximum 30 gpm/sq.ft.
Backwash rate at 68ºF 3 gpm/sq.ft.
Anion rinse rate, normal 4 gpm/sq.ft.
Cation rinse rate, normal 6 gpm/sq.ft.***
Rinse volume, cation resin 40 gal/cu.ft.
Rinse volume, anion resin 80 gal/cu.ft.
Air mix, design 7 to 8 cfm/sq.ft. at 7-8 psig
Rising space 100%
*** Cation resin is rinsed upflow at 1.0 gpm/sq.ft. minimum, or at a higher rate when required to provide minimum rinse volume during caustic regeneration of anion resin.