How often should the fill solution in the Ammonia membrane module be replaced?
Filling solution replacement schedule
When the membrane module is removed to store the glass bulb in its storage soaker bottle for long term storage, the filling solution should be replaced. If the electrode is left out in the air (not in storage soaker bottle) for more than one hour, it is also recommended to replenish the fill solution. Additionally, if measurement drift, poor response, or failed calibration occurs with a relatively new membrane module, the filling solution may need to be replaced.