Salt water correct

Maybe it has more in it than your previous salt mix. Some have excessive calcium levels, and some less than NSW.

Have you measured the calcium level in it?
What salt did you previously use?
 
I was using IO. No matter what i did i could never get the levels up and keep them up. After using salt water correct i had a very stable Ca level of 440. It was stable with no kalk for months .The reason im asking is people are saying that this is impossible. (the people are not chemists just know it all's) Granted i didnt have a lot of corals at the time
 
IO has lower than normal calcium, and that might explain part of your previous calcium problems. Some salts, like Oceanic, have excessively high calcium, and if used for water changes it could supply the calcium necessary for a low demand tank.

Were you supplementing alkalinity in some way?
 
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