I feel like everyday every salt gets blamed for a problem, and it's always something that directly relates to it (ie Algae just then showed up, etc). To be completely honest I think it's far more complicated than that, but it's just easier to point at the salt. I've used various salts (IO, RC, Oceanic, RSCP, etc) in my ten years in the hobby, and have only had one bad batch among all of them, one I should have tested Alk for.
I currently use RSCP, have been doing so for about a year or so. I haven't had a bad experience with this brand of salt, but have minor complaints about it. For instance, I do a weekly 5G water change on my 40Br. While the end result of the salt water is good for me (Alk stays pretty normal, though not always as stated by them), what it does to my mixing equipment sucks. The white chalky residue left over inside the bucket, Koralia 3, and Ebojager Heater is pretty thick. It forces me to run a vinegar bath after about a month (Four water changes).
While RSCP gives me that problem, other salts I have used haven't been without problems of their own, especially in what they leave behind. For instance, RC always left a brown residue in my bucket and mixing equipment. IO did the same. Oceanic did it worse, but that, like IO, was years ago... and things change.
I am currently going to stick with RSCP until I run into a bad batch which could possibly have me turn to a new source. What I would like, more than anything, is another round of salt testing on all brands. That would be awesome to see again!
