Tony,
Just to add to your thoughts, I have been using Kent from about the same time as you have but have not seen similar things happening. The difference in my mixing habits are that I don't bother heating the water prior or after adding salt. I do use RO (no DI.) I have just mixed the water with a MJ power head and added it to the tank after 12hrs at a rather slow rate (eg 6 litres/hr.) Haven't noticed any percipitation within the mixing bucket.
Kari
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