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What is the operating depth? If the bushings are fully seated and the skimmer is in a depth of 6-7" the most likely culprits will be the air intake housing (bottom of pump with air hose attachment) is the wrong one, or the impeller has some blemish. Squealing will come from a bushing being dragged, usually because it is loose, or from too much air being taken in (wrong intake). How long have you had it?
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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