as i know, ferrous iron (Fe2+) will convert to ferric iron (Fe3+) if we mix water contain iron (such as groundwater) with chlorine. then the water should go through filtration process to filter the extractable iron (Fe3+). that how we can reduce the content of iron in water. my question is...which process is reduced the iron content? chlorination or filtration? because as what i understand, the chlorination process will convert Fe2+ to Fe3+ only, the content of iron still not change. But the process that remove the iron in water is filtration. am i right? because when i put some chlorine in water and then i tested it without go through filtration process, i figure out that the iron level in the water was already reduced, and reduce more when i filtered it. is that chlorination process can reduce level of iron in water by itself without filtration process?