When I'm filtering after getting my syrup to the right density I take a sample in a small glass cup and let it cool while I pour my syrup through the filter. I like syrup at room temp and my wife and I taste it. This year we both came to same conclusion that the syrup had an off flavor. I described it as dirty and she described it as a bad after taste. After filtering I did the same thing and we both thought the syrup tasted fine. Could we have been tasting niter? If so what are peoples descriptions of niters taste?