Finally got around to the trim & musical chairs. Also took out 4gals / added 8gals of fresh solution.
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I topped up a few times in the last week with fresh water - TDS went down for a day and bounced right back up. The pH has been trending down for a couple days too... Initial reaction was concern, but I did also just turn on my dehum this week - I think I'm seeing some evaporation. Gonna need to maintain a watchful eye for the remaining weeks, though...