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You can't ever run a filter without water. You will damage and break it. I'm sure the new filter is just fine once you have it fully submerged. When using it for the first time, give it a few 180 degree turns in the tank to make sure there are no air bubble trapped. And make sure there is at least 1" of water above the filter once you attach it to the glassits just making a squeeling shrill sound - its not in the water yet