Hey all. First water change I bought premixed saltwater from the LFS for 1.50 a gal. !!!!!! cant make a habit of that ! What steps are recommended for mixing your own. I understand how to mix it and check the salinity. Does it need to be circulated for a period of time ??? I read that Instant Ocean claims to mix and use ????? Also depending on the temp. of the RO might have to add a heater ?? Guess if needed buying the extras would pay off in the long run.