Discussion
State whether the following is true or false.
Suspended solids must be removed before water enters an ion exchange softener.
Answer: A
Correct answer: True
Suspended solids foul the resin bed: they coat the beads, reducing the surface available for exchange, and they block the flow so that the bed channels and its capacity falls. Regeneration does not remove them. A sand or multimedia filter ahead of the softener is therefore standard, and it is far cheaper than replacing a fouled resin charge.
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