sorry , my bad , i ment Na2SO4
Sorry for the lack of explanation, My water comes from a biological reactor capting H2S and converting it into SO4 , H2SO4 makes the pH decrease and they are keeping the pH between 5,5 a 7 by adding NaOH.
So my water contain some Na+, i gave this useless info and did not introduce it.Sorry
If i use CaO as powder and procure a high agitation i might still get CaSO4 right? Of course , as you said, i will not get a 100% convertion ratio but i might get a convertion ratio that might be interesting , atleast to try it in lab?
Thanks for your help sir