Please explain how channeling or installing the canister incorrectly would increase TDS. I do understand how these issues could prevent deionization, just not how they could add solids.
DI resin can purge certain contaminants once exhausted. So if the water can only come in contact with a limited amount of DI resin, it can purge contaminants that will read an electrical charge, plus the TDS that's already entering the canister. This will make it appear that there are more TDS exiting vs entering. What some RODI users don't know is that TDS meters actually read conductivity, not actual TDS.