Gravity Water

How can I increase specific Gravity of water from 1 to atleast 1.9.?

i have to wash PET in water & Specific gravity of PET is 1.7, so I want to be floting PET while washing. That only can be possible when specific gravity of water will be grater than specefic gravity of water.

Add salt to the water.

— http://www.google.com/search?hl=en&q=specific+gravity+water+salt&btnG=Search

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