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Do you have any ideas about the trapping mechanism? Could PO4 be dissolved in high concentration in the water between the sand grain or in the stagnant boundary layer around the sand Grain? Are there other solid materials in an aquarium that reside between the sand grain and adsorb PO4?Im just wondering if some phosphates are just being trapped in between the sand grains instead of being inside the sand grain. And I’m wondering if agitation of the sand will increase the overhaul phosphates.