I know some filters can take around 300 gallons to back wash not sure I remember what the backwash gallons needed for this filter but I would make it so it is low in the tank. Smaller pump might take more time to clear it all out also. Will be interesting to see how it all works and how many gallons are needed to backwash it. You sure that pump is going to be large enough that filter? I would be worried my self. How much media you placing in it? Full load
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