I haven’t noticed that yet. A lot of the goop is from decayed duckweed and poo debris getting jammed near the impeller. Might take 3-6 months for the impeller to get stopped by the goop. Vaseline isn’t a very good long term lubricant for aquarium impellers because you’ll open it up a week or two after being applied and sometimes it will be gone (probably sucked out and globbed somewhere else inside the filter). Really good temporary solution though.