I'm going to start using NSW with my next water change this weekend. I mixed the NSW in with the extra pre-made water I had left over from my last water change to try to integrate the two. Then I plan on doing weekly 10% changes to minimize the impact of having two different parameters (tank vs NSW). I agree with Jim...the ocean is where they all came from, why try to "improve" it. But I think you need to go slow when starting to minimize the impact. I am looking forward to no more salt expense and hopefully more beneficial bacteria, organisms, etc!