Discussion
A zeolite bed of capacity 500 mg CaCO\( _3 \) equivalent per litre of bed, holding 20 litres of zeolite, will soften water of 250 ppm hardness to the extent of
Answer: D
The bed holds 10 000 milligrams of equivalent, and each litre of this water brings 250 milligrams, so forty litres exhaust it. The bed must then be taken off line and regenerated with a ten per cent brine solution before it will soften anything further.
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