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I am unable to see any bubbles in the video? There are no openings in the middle, bubbles would either come from the top or the bottom. Typically bubbles are caused by the skimmer being submerged too deep and the air being closed off to much. The marked water line should be regarded as a maximum and may be up to 1" below that. The air should be open as much as possible, the least bubbles will be present in the default recirculating mode the skimmer was delivered in with the blue bubble trap sponge with the hole in place around the strainer of the pump in the outlet diffuser.
While that is true, I wouldn't expect that to take more than a few weeks if the skimmer is left alone (not opened or cleaned).