just remove the bac pac and mineral pac and throw them away and then insert trichlor pucks into the feeder. That's what I do. The frog system is pretty decent as an erosion feeder as you can dial in the flow pretty well. The frog bac pacs are simply trichlor tablets in a plastic shell, just ditch that shell and buy a big tub of pucks at home depot. I suppose you could use the smaller tablets instead of the 3" pucks as well.
-- john
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