Overall dimensions are 42L x 18W x 18H. The roomy first chamber measures 12 x 17.5 to accommodate most in-sump protein skimmers, the bio-ball chamber holds 7.5 gallons of 1 inch mini bio-balls. The covered drip tray and easy access drip tray make maintenace a breeze. There are two 1 inch threaded inlet and outlet (for external return pump) and an additional ¾ inch threaded bulkhead for submersible return pump. Maximum flow rate is 1500 GPH and filtering capacity for this model is rated for 300 gallons. Recommended skimmer: ASM G-4 or G-4X.
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