Some quick thoughts (which may have already been addressed):
1) Get a Triton water test done. Maybe you have something rusting. Maybe you have something getting in the RODI, who knows. Find out.
2) Get a calibration solution and properly calibrate your refractometer and check salinity.
1) Get a Triton water test done. Maybe you have something rusting. Maybe you have something getting in the RODI, who knows. Find out.
2) Get a calibration solution and properly calibrate your refractometer and check salinity.
