01-14-2007, 08:13 AM
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TR needle wheel impellers do all the work for us. On beckett style injection skimmers you can run any pump you want. Once the water LEAVES the pump and is headed to the skimmer a venturi tube adds air to the flowing water. This is then whisked into the contact chamber and up the bubble tower to make foam. They are very touchy as to much water flow can restrict the amount of air being injected. To slow of flow and you make a mess. Then they need to have the air mixture controlled and the riser height tweaked, that's what all that white PVC is. The old style uses a cheap PVC repair coupling. Loosen one end and raise the pipe, then lock it all back down. Note that a hole has been drilled into the collection cup for a resvoir cup. Basically you'll need a length of tubing and an old milk jug. Also the depth of the water in the sump can change how they work.
A needle wheel injects the air into the pump and the pump mashes the bubbles into micro bubbles. Much more efficient. Ususally to adjust them you need only raise and lower the overflow pipes. Most of the ASM, ER, Deltec style skimmers use to matched pieces of pipe that you only need give a twist and pull. No more loosening and adjusting.