To reinforce Randy's caution, you've not said why you think you have a problem. Nutrient control is appropriate if you have serious algae issues, but there are a lot of well-established tanks with relatively a high phosphate concentration in the water (around 1-3 ppm) that thrive with little algae issues. Part of the reason for their success is that they've a great deal of stony coral cover and a lot of herbivorous creatures that keep algae growth in check.
If you do have out of control algae growth, and wish to drop the phosphate concentration in your tank water to help control it, there's a couple of key points that you should know. If you have SPS, especially acropora, and you make a mistake with the products you've mentioned and drastically reduce a phosphate concentration in the ppm range down to 100 ppb or less that is often recommended, there's a high likelihood of killing your corals. SPS and acropora specifically adapt to environmental conditions in a tank within a couple of months, and can't tolerate rapid changes. Alkalinity is an oft-referenced parameter that SPS corals are very sensitive to, but they are also quite sensitive to dissolved nutrients including phosphate. So you need to reduce your tank water's phosphate concentration slowly over the course of a couple of months.
The second key point is that phosphate binds to calcerous substrates in a tank as calcium phosphate. The effect of that chemistry is that your tank water's phosphate concentration may not seem to budge at all even with a great deal of GFO/lanthanum chloride. Until this precipitated reservoir is depleted, and then phosphate concentrations "crash", with the attendant problems noted above.
