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Hi guys. I double di in the van. My tds is up to 005. Which vessel do I change the resin in. I'm sure it's the second vessel, which then becomes the first vessel with new resin in. I'm tired, and just checking. Many thanks.
You need to change the resin in the first vessel into which the water flows (this will be the vessel with the highest TDS). You then swap the vessels around, so the vessel with the new resin becomes the second vessel.
