Offer premium biological filtration and polishingOne-piece fiberglass reinforced tank with superior strength and durability360-degree diffuser keeps sand bed level for extended filter cyclesSwing away diffuser allows instant access to sand and all threaded internal parts10-year tank warrantyThe fine sand granules provide great biological filtration as well as polishing for a crystal clear pond. Heavy-duty closure provides easy inspection and features an easy-to-read pressure gauge and air relief valve. Purchase additional Multiport Valves separately. For external use only.Model MeasurementgphPond Size3531-1/2" x 16" D2100up 4200 gallons-->4037" x 18-3/4" D2400up 4800 gallons5038-1/2" x 21-1/4" D3000up 6000 gallons-->6047-1/4" x 30" D3600up 7200 gallons

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