You should have 3 vertical filters which contain the 5 micron, carbon and then another filter (I think its coconut or another 5 micron filter not sure which). Then the horizontal ones are a RO filter (which comes in white plastic cylinder) and the top see through one should be your DI. I'm not sure about a sponge filter?? The DI is a color changing resin that goes from a browny color to orange when its exhausted.
OA sells the filters. I'm not sure what the price is vs getting them from aquasafe unless you're buying them in bulk (aquasafe really nails you on the shipping IMO).
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