Hey Greg the same thing happens to my water.
It's no big deal at all. I have a Vertek Puratek unit and after a few days of it not producing water for my reservoir the TDS has gone up to 44-45.
Been like that from the day I got it and it's a been a few years. I'm thinking in my case though it's just the watwr that sits stagnant in the line that the TDS meter is attached to. Besides your in B.C. we have great water.
