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Hi Sarah

Just to clarify a previous answer. In my experience of testing some handpump supplies in Uganda, high dissolved iron can originate from corrosion of GI riser pipes. There is documentation of this, notably an extensive study undertaken in West aftrica in the 1980s and documented by Langenegger (1992). A copy is available on the RWSN website https://rural-water-supply.net/en/resources/details/604.

Regards

Lawrence