Chemical Process
Hard water

All of these
Is not unfit for drinking purpose
Does not affect the lather formation by soap
Pollutes the water stream

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Chemical Process
Presence of sodium tripolyphosphate (an additive) in synthetic detergent

None of these
Inhibits its corrosive effects
Facilitates its use even in hard water (by sequestering the water-hardening Ca & Mg ions)
Does not allow redeposition of dirt on the cleaned surface

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