Quote:
Originally Posted by Aquatek
A needle wheel is just another form of impeller. If there is no air then there is no bubbles. The only way you can create bubbles is with a venturi or your sump runs dry. I have used this style of pump in many of my tanks. You are correct that they get used in skimmers to chop the bubbles but work equally well as a pump to push water, they are just rated for less gph. Either way, I have a regular pump as well. Your choice. I'll bring both.
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Thanks but I already know a skimmer needs air in order to create a lot of bubbles. A needle wheel is just a flat plate with a bunch of pins sticking out of it used to mix air and water into a froth, it will move very little water against any head pressure. You need to know the GPH against a pump curve that will tell you how many GPH it can actually do at at the height of your return line into the display tank. The GPH printed on the pump is at 0 feet of height. A regular centrifugal impeller will by far produce more flow. Keep in mind though that you don't need a ton of flow through your sump, I used a Mag9.5 on my 90g DT and 45g sump and still had to dial the discharge flow down a bit.