Response to Hi, Dave. This Whisperflo EE 1/2 will be sufficient for circulating 5000 gallons of water. With 20 feet of heat this pump will produce a flow rate of 85 GPM, so you will have to make sure that your filter can handle that water flow. If it can not you may need to use a different pump like the Hayward Super Pump - SP2607X5.

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