Chemical Process
Builders are added in soap to act as

Corrosion inhibitor
Cleaning power booster
Anti-redeposition agent
Fabric brightener

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Chemical Process
Reverse osmosis is normally used for the

Purification of oxygen
Separation of isotopes of uranium from gaseous uranium hexaflouride
Desalination of brackish water to produce potable (drinking) water
Separation of helium from natural gas

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