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Step 1
Find a vendor that sells recycled car coolant by consulting your state's branch of the Environmental Protection Agency (EPA). You can find your state agency at EPA.gov (see Resources below).
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Step 2
Contact the vendor and ask what method he uses when he recycles car coolant. Inquire about whether the method used guarantees that soluble salts are removed from the antifreeze. Take note of the method the vendor uses and use it to guide your research.
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Step 3
Exercise caution if the vendor uses chemical or regular filtration, oxidation or centrifugal filtration as a recycling method. These methods will usually remove large salt deposits and soluble salts from coolants, but often do not get dissolved salts out of the product. This can spell trouble for your coolant system down the road if you rely on recycled antifreeze or coolant for the long term.
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Step 4
Select recycled antifreeze that is subjected to a secondary recycling method in addition to centrifugal, chemical or regular filtration. Simply recycling using a filtration method will not remove chloride compounds from the antifreeze. Make sure the recycled antifreeze you buy has also been distilled or run through a reverse-osmosis process.
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Step 5
Ask for data detailing the chloride and salt content of the recycled antifreeze. There should be low levels of both in the final product if any is present at all. Select a different recycled car coolant that has little chloride or salt left in it, or purchase new antifreeze or coolant instead.
