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Another low cost option developed with Bangladesh in mind is arsenic phyto-extraction.

This method was developed by Stephen Goodwin Honan a PhD student from Oxford University. His "Clean Water" uses plastic containers and local ferns to extract the arsenic, although I'm not sure whether it has any impacts on iron levels.

Unfortunately there is no specific website on the technology, but a short overview can be found here. a 500 strong field testing was ongoing in 2014,. https://www.dezeen.com/2013/09/17/plant-based-water-purifying-system-named-idea-that-will-change-the-world/