Well, I just bought 2 200gal buckets at the lfs because it was on sale ($45). Tested the first 2 batches. Both came up slightly positive for both nitrates and phosphates. I'll use it anyway because I don't have any corals yet, and wont 'til this salt is gone, most likely. Maybe it was on sale because it's the last of the old formula, but I doubt I'll buy it again.