Phosphates are difficult to bring down without GFO. I battled phosphates for months, and I didn't really make a dent in them until I started running ROWAphos in a reactor.
At this time I am running ROWAphos in a TLF 150 reactor and have Chemi-pure elite in my tank as well. They don't seem to be doing it..
__________________ Ashr Red Sea Max 250, 66g Mixed Reef