Pukani definitely leaches phosphates. I had loads of green sheet algae the first month of cycling it in my tank, as I just dropped it right in. GFO did a great job soaking it all up, and carbon prevented any horrible odors. Within 2 months it was no longer an issue.
Reef Saver shouldn't have the same problem. It's been pre-cleaned, and it isn't grabbed from the ocean.
I may try the RC sponsor "Reef Rocks", as they look like they have the same type of rock, but for much cheaper.