High background problem

[stdev]

Hello everyone,

I am running a method with 20 mM KOH mobile phase, for anions. When I pass water through my system, without column the background is ok. When I pass the mobile phase with column, I get a huge background. I changed suppressor and regenerant and nothing changed. Any suggestions?

[Markus Laeubli, Metrohm]

Please give more information like instrument, suppressor type, measured conductivity etc.