How critical carbon filter after Katalox Lite?

[Ĝan Ŭesli Starling]

Am looking at quotes from vendors after submitting my water testing report. Am seeing Katalox Lite with O3 ahead of regular softener and no carbon filter between. Elsewhere I read of a back-washing carbon filter being important after Katalox. Some enlightenement, please, as to when and when not.

 

[ditttohead]

Typically not needed. If you are doing oxidant injection ahead of the KL like chlorine or h2o2, then yes, carbon may be a good idea especially if you are not really good at controlling the injection to proper levels and testing residuals, but otherwise, it is not required by any means.