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That is what I observed for aragonite sand.I'm not sure what material you are asking about, but phosphate bound to a surface is in constant flux between bound to the surface and free in the water.
I did observe that not all the phosphate comes off again. I did not do the work needed to determine if there was irreversible adsorption for sure and if there was did it diminish the capacity of the aragonite sand to adsorb phosphate. The other aspect is whether the aragonite surface becomes so fouled with life that adsorption stops.