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I'm talking about the kitchen sink. Why not just connect the filters to the regular tap?

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The kitchen sink is used for various other purposes than getting a glass of water to drink. So you don't want to be wasting the filter when doing your dishes.

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Water filters that remove chemicals and such require significant contact time with the filter media (media is often activated carbon) to be effective.

This contact time requirement restricts flow significantly, so much that you would not be able to efficiently perform other common tasks that are normally done in the kitchen sink: rinse/wash dishes, wash fruits and veggies, fill pots with water, wash hands, etc.

  • So how does the whole house filter can deal with it? – Ronen Festinger Nov 24 '16 at 20:55
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    Whole-house units are merely sediment filters, no"contact time" needed; However; even those cause a noticeable and measurable restriction to flow. – Jimmy Fix-it Nov 24 '16 at 21:11

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