Attached file is RO DI system design for your customer. so far I have only water analysis and source is RO permeated as shown . what we have :
325 lit small columns , one is cation and the other one is anion.
I recommend to use Amberlite IR120 H and Amberlite IRA402 Cl for cation and anion respectively.
If you don’t have IR120H then you can offer IR120 Na with triple normal chemical regeneration prior to use.
Flow rate is 3 m3/hr as calculation. if customer operated lower than this , pls let me know.
Cycle time is 100 days with 30 m3/day, so total is around 3000 m3per one regeneration .
HCl used is 55 gram per one lit of cation resin and NaOH is 100 gram per one lit of resin too.