Here are some examples from practice.
Arsenic removal - Case Study
A well water must be significantly reduced in addition to other treatment steps in its arsenic content.
O2 Removal - Case Study
For the construction of a brewery, a system for the removal of oxygen should be installed as part of the water treatment.
Case study Carbonic acid removal
Carbonic acid must be removed, because the replacement of material resistant piping would require considerable investment.