DEPOSITION OF SALTS

I run HPLC 1260, during analysis, we have seen that there was deposition of dried salts in the knot of outlet valve, injecting site , and in thermo too. We are using Millipore water for hplc mobile phase preparation and column washing. Can anyone have idea how much conductivity of water is limited in Millipore water and how can we take care of those salts in hplc? And What may be the reason behind that salt deposition and how to control that?

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