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Ide recommend an in line filter for that co2 tank. Had a 20# set up for my kegerator (had a tank just for carb water) The gas should be clean but there was definitely an odd taste to it until I installed a filter. A bit expensive at <200USD but highly recommend.
I was under the impression that my source was food grade as well, but I noticed it when coming from soda stream to kegged carb water having a slight bitter taste. Disappeared with the filter and subsequent refills for both soda and beer. It could very well be how strong I made the carb water too.