If I'm filling my 5g bucket with ro/di with my membranes etc as is right now the rest I can get out of my membrane is about 7 TDS before resin.
Now that I fill a 45g tank every couple weeks it runs for many hours and eventually goes as low as 2 TDS pre-resin so that helps.
I also see TDS creep after having the water turned off for even 10 min. Since I started bypassing water until the TDS goes down I have made my very first portion of resin last since I got back into the hobby.
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