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Originally Posted by Marty  The reason you want one that pumps more is becaue you are fighting gravity to get it back up. Also you should regulate flow with a ball valve in the retun line after the pump. | LoL trust me gravity has little to do with it in that situation. Especially when we're talking about a mag drive that has a 13' head height (like a mag 7) before it shuts off. Even so, going with a mag 7 again (700gph), if you're pumping it up about 4 feet like me, than it's still pushing 480gph. So if you have an overflow that does half of your return pump, which would be 350gph in this example, you're still gonna overflow the tank unless you're pumping it up at least 7 or 8 feet.
Regulating the flow with a ball valve tends to wear down the longevity of the pump, too. _________ 125 Gal Reef. Born March 2002 FISH: Ocellaris Clown, Yellow Tang, Fairy Wrasse, Sand Star, Fuzzy Dwarf Lion, Mandarin Dragonette, Hippo Tang CORALS: Green Striped/Red/Purple Mushrooms, Green Star Polyps, Yellow Toadstool Leather, Bubble, Frogspawn, 2 Hammers, Yellow Polyps, Open Brain, Ridge Leather, Various Zoas, Button Polyps, Kenya Tree, Colt, Elephant Ear Mushroom, Clove Polyps, Torch, Purple Clam, Rose BTA  |