Getting back into the hobby after a long lapse due to kids. Which means I am using some.older equipment. My rodi from BRS was pulled out of storage. I replaced all 3 filters and replaced the RODI resin. My TDS meter is being stubborn and still showing 1 with all of the changeouts. I've never experienced this before. I always only used TDS of 0. Would like some advice. Is it possible the meter itself is old and showing inaccurate readings? What is the harm of a TDS of 1 if it is rating true? Would love community input.