Iron can be removed from water using which method?

The removal of iron from water is effectively achieved through the use of water softeners, iron filters, and polyphosphate systems, making this option the most appropriate choice.

Water softeners work by exchanging the iron ions in the water with sodium ions, effectively reducing the concentration of iron. Iron filters are specifically designed to oxidize and precipitate dissolved iron, allowing it to be physically removed from the water. Polyphosphate is used to inhibit the precipitation of iron and can help maintain iron in a soluble state, aiding in its removal during the treatment process.

In contrast, reverse osmosis primarily removes dissolved solids and certain contaminants but is not specifically tailored for iron removal and may not be as efficient in handling higher levels of iron. Boiling water does not remove iron; it can actually concentrate it since boiling reduces water volume without eliminating iron content. Activated charcoal is effective in removing certain organic compounds and chlorine, but it is not suitable for effectively removing dissolved metals like iron from water.