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When i started out i purchased a large bag of the LA salt as well and came across the same exact thing. Then again i was using the api test kit as well. I did test just my ro water and it came up at zero. It wasn’t until i mixed that i ran into this same issue. I was using it for small water changes so once i used it up i changed to RPM salt.
I let the water aerate for 24hrs and it still registers .5ppm. Tested my RO source water at 0ppm and 0 tds. LA response was ‘We have had no issues with our salt at this time.’ Seemed like an odd response considering it was the last box I had from an order when it first released over a year ago.

