Warner Marine PHOSaR, Feedback please

[Montrosereef]

Has anyone tried PHOsaR by Warner Marine for SPS tanks? I have been using GFO from BRS with caustion and would like to start using PHOsaR.
Any pros and cons would be appreciated. Thanks!

 

[KSzegi]

Personally loved it but can't find it anymore, switched over to BRS hc when I used my last up ...... where are you able to get it?

The only con that I can think of with it was that it was a bit dustier than the BRS HC - but not a big deal to me.