Randy Holmes-Farley
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Because I already used all of the few 3 suggestions? Go somewhere else smh
If you want to rule out source water, you can use a different type of water to make some new salt water and check the ammonia.
If low (less than 0.5 ppm) it says it is not from your fresh water.
If still at 2 ppm, then it is either the kit or the salt.