What are two main ways to reduce energy use ?

Appliances. Unplug your appliances when they're not in use.

Heating and cooling. Insulate your roof or ceiling.

Transport. Even if you have a fuel-efficient car, whenever possible it's a good idea to leave it at home and walk, cycle, catch public transport or car pool.

Water. Water-efficiency labels.

Explanation:

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a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

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