I don't really know, just to make sure there are no other chem in it, you just don't know how the chemical reaction when they mixed together. It's can damage the tubing, pump and the block, rad as well. If you are uncertain then use distilled water and if no distilled water available where you leave then you can use drinking bottled water (reversed osmosis), this is purefied water, I think it is about 90 - 98% or so chemical free.
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