I have gone through three buckets of this salt and I am pleased with the results thus far. It mixes up nicely (though there is a bit of a smell when you first add it) and leaves 0 residue in the bottom of the container. Alk measures 9.6 in the batches I have used and CA 430 for me. I have not noted any ill effects from changing to this from reef crystals. The fact that it is not out sourced is something that is also a big deal to me. I like the idea of tighter quality control especially with threads that report bad salt batches or inconsistencies from bucket to bucket in other brands. So far this salt gets an A from me.