Billy8998 said:It works out as less than 5% of the volume per bottle when the whole process is complete so don't worry too much. I'd say an $8 bottle of any will do just fine. It's more about preventing oxidation than anything else so without diluting with water any will do. I had the same worry first time I topped up but after a ton of kits it genuinely makes little impact. As I say less than 5%
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