Do you fill it up immediately or let it dry out? Leaving water in a bucket for 6-7 days sometimes causes a biofilm to build up on the sides of the bucket. Try wiping that out with a paper towel and then let it dry completely before filling it back up again. That might help.
I was gonna check the TDS in my reservoir bucket but my the batteries in my TDS are dead. I think I've checked my ATO reservoir and the TDS was definitely higher than the 1.0 that comes out of my RODI. About 25 or so.
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