I guess it's Anionic ...

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I guess it's Anionic exchanger, anyhow you have to use food grade Cation and Anion Exchangers. Be attend of water temperature as > 35/40 deg C the smell of Amines from Anion IEX can be increased. Max. working temperature of strong basic IEX is 60 degC. > 60 deg C you decrease functional quaternet Amino groups to create Amine/Ammonia like smells.Check your process. Look also in your rinsing times, may your raw water smell too?

BR Dieter