I bought this cheap and easy to use device for my carp pond. I wanted to keep it under 6 ppt. I followed the salt recommendations but decided that after adding 2 cups to my 2500 gallon pond (so very little) I would measure it along the way to be sure. I didn't expect it to be 6 ppt already. I'm freaking out! I went to the aquarium shop to have them check the salinity with their fancy devices. I her test came up with zero. Relieved but irritated. This thing is completely useless to me.
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