I have also had a problem with phosphates, and tried everything I could think of without using chemical warfare. I gave in. Two days ago I received my phosban reactor from captivereefs.com. So far, so good. No bad reactions to corals or inverts, and this morning my phosphates were at zero. I did a water change yesterday and vacuumed my sand. Today, there is far less cyno on the sand, and my glass is clean - YIPEE!
I feel for you, make sure the product is reef safe - I understand the only two that are truly reef safe are phosban and Rowa. Captivereefs has both.
Hope this helps.
55 gal. reef. Coralife lunar lights 4 x 65, 120 lbs live rock. Remora skimmer, 3 power heads. 2 tank raise false percula,2 pajama cardinal,hermits, snails, Xenia, leathers, mushrooms, polyp frags, yellow sea cucumber, And last but not least - the miserable mantis.