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You want to remove the drive unit and clean it as shown in the manual. Soaking alone without removing the drive unit does very little good. Not enough of the vinegar solution gets into the drive unit this way.
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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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