What salt are you using?Added a 10" 5 micron filter to the mixing station to remove any sediment left over in the salt tank before it goes to the display during water changes.
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Red Sea Blue Bucket. I don't always use all of it right away after mixing so in storage I'm thinking some of it comes out of solution. You can see a difference in the 2 tanks side by side. The one on the right stores mixed water and appears darker from some sediment build up on the inside.What salt are you using?