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according to link it does remove phosphate
True, and it is wrong, or at least misleading. Don't believe everything you read from manufacturers. Much is demonstrably wrong.
That's a main reason to have a reef chemistry forum with folks who understand products: because so many companies stretch the truth far beyond reality. Boyd, along with a few other companies like Brightwell, is one of the poster children companies for misleading claims.
None of the materials in Chemipure Blue will bind significant phosphate from seawater. The polymer and possibly even the activated carbon may directly bind some phosphate from freshwater, and that may (or may not) be a nugget of truth behind the sweeping claim. It does not do so in seawater.
So, you are probably thinking this guy says it won't and the company says it will. Who to believe?
I have personally designed and synthesized hundreds of novel polymers to find the best ones to bind phosphate, and have been on and/or led teams of other chemists and analytical scientists doing the same thing for more than 20 years. One of the products that I co-invented has likely sold more product than ALL hobby polymer media combined (selling more than a billion dollars worth of sevelamer hydrochloride and sevelamer carbonate each year to treat hyperphosphatemia in people ).
There is just too much competition from sulfate and chloride in seawater for polymers to bind appreciable phosphate at the concentrations reef aquaria typically encounter. To verify this assertion, I took one of the best known known phosphate binders (sevelamer hydrochloride) and tested it in a water sample from my reef tank. It did not bind any significant amount.