Is that 24 foot diameter or circumference? If diameter then the pond's capacity is about 10,000 gallons. Is this a lined pond or earthen bottom?
The amount of biofiltration that you will need is not based on pond capacity but on what will be the approximate ultimate fish load.
However, if even a reasonable fish load is planned the turnover rate for the pond must be sufficient to move the Ammonia excreted by the fish and other pollutants to the mechanical and biofiltration at a rate that will minimize any effect to the fish. Normally, a turnover rate of 1.5 - 2 times per hour is recommended.
Returning to the opening question, if your pond's capacity is indeed 10,000 gallons then you will need 15,000 - 20,000 gph in flow rate if this is a lined pond. A 2600 gph fountain pump will be sorely inadequate. The filtration will need the ability to handle this flow rate if this is a lined pond. If an earthen bottom pond, supplemental filtration should not be required.