Answer
MSM Suppressor
PTFE capillaries are soft, do not tighten the screws too much; if the capillaries are squeezed, cut off the first few millimeters using a capillary cutter.
Do not operate the suppressor under dry conditions!
In case the background conductivity is too high check the flow rates of the sulfuric acid and of the ultrapure water.

Protection
To avoid contamination of the suppressor module by foreign particles or bacterial growth, the 6.2821.120 Inline Filter 2 ┬Ám supplied must be installed between peristaltic pump and inlet capillaries of the suppressor module.

Operation
The Metrohm Suppressor Module MSM comprises a total of 3 suppressor units which are in turn used for suppression, regenerated with sulfuric acid and rinsed with water. To record every new chromatogram under comparable conditions, each analysis is carried out with a freshly regenerated suppressor. Switching between the suppressor units takes place automatically between the chromatograms.
For operation of the suppressor module, a two-channel peristaltic pump is needed which conveys the regeneration solution (normally 100 mmol/L H2SO4) and the rinsing solution (normally dist. H2O) to the suppressor units (flow rate of 0.3 mL/min). The suppressor should always be regenerated with H2SO4 in the opposite flow direction used for the eluent. Therefore, always install the suppressor according to the labels on the connection piece.
The suppressor module must never be switched in the dry state as there is a danger of blocking.
The capacity of the suppressor units is exhausted after approx. 2 h or less, depending on the eluent and the flow rate. With longer interruptions between the individual measurements it is recommended to use the Autostep of MagIC Net which automatically switches the MSM e.g., every 10 min.

Maintenance
In the event of reduced capacity or high back pressure, the suppressor module must be regenerated, cleaned or exchanged.