I put a drain line and cap on the cooling systems of my vehicles that way I can pull the drain line away from the dirty enclosure clean off the end of the line and drain it to a clean container.
Once its safely captured I check it for clarity and freeze/boil point with a hydrometer and pH test it.
Then when I pour it back in I run it through a cloth filter if its still good.
It saves me $10 to $20 most times I open up a cooling system.
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