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Doctors Medicines MCQs Q&A

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Collected calcium, iron and magnesium ions (hardness ions) in the bed need to be flushed out. This is done by sending water at a high flow rate though the bed in reverse direction of normal water flow. So to answer your question, all water softeners must have a drain that backwashes the softener bed periodically. If you just need particulate contaminants removed from water, you can go with a big blue cartridge filter instead of a softener and avoid the need for a drain.

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