You should get one that is capable of circulating 1200 - 1600 gallons per hour so your water volume would be turned over 1.5 to 2x every hour. This can be accomplished with one pump or multiple pumps depending on your setup. For example: are you planning on connecting a waterfall feature to the bog somehow or would it be separate to where you might need more than one pump? My above ground pond has a "bog box" that spills back into the pond via a waterfall so I only use one 1000 gph pump for my 450-475 gallon pond.
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