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The recommended gph is to keep the granules from bouncing around and grinding up in a loose setting. You can run it faster through a cannister filter. Your change schedule should be based on the effluent coming out. If it starts showing phosphate, change it.
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Current Tank Info: 180g sps+75 softy/lps on one system tunze's, seio's, mjmods, aquacontroller w/add ons, 2X400 XM10000 and 3X160 vho actinic, 110g sump, 110 frag tank, Geo Beckett and other stuff
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