RO/DI issues

Blue Ring Octopus

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10" Maxcap DI Resin Filter Cartridge (DI-MC-10) - Spectrapure
So at moment I have a single DI
All filters are new, city water in 275 out 7 tds
DI out 11 tds
So prior Maxcap then Anion then mixed bed
I was burning through the mIxed bed.
So I pulled the Anion and Mixed bed, only installed Maxcap

Why would a Maxcap DI have a read of 11 TDS
 
So I just re checked it so after running for 30 minutes it is reading 1PPM
Thanks everyone
 

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