Choosing phosban reactor for 250 gal tank?

[surgeonfish]

I have a reef tank with lots of fish. Despite my best efforts, my phosphate levels are usually >1ppm. I would like to reduce this with a phosphate reactor.

For a 250 gal. system, what size and kind of phosphate reactor should I use? As far as I can tell, the only one readily available in Canada is the Two Little Fishies Phosban Reactor 150. It is suppose to have a capacity up to 150 gal. I don’t think this would be large enough.

Does anyone recommend a different brand with a higher capacity or should I try running two Phosban 150 Reactor’s together? Does anyone run more than one, and if so, do you run them separately or together as a circuit?
Tanks,
Shane