Originally Posted by Mokrytzki
Ehiem actually recommends Vaseline for lubricating their gaskets in their manuals. I also had a marineland canister that lasted a few years and now leaks everywhere. Now I use an eheim 2028 and fluval 206 and have used for several years with no issues. Marineland customer service was absolutely useless and therefor I will not use them again.
I'd always heard no Vaseline on anything rubber-based because it degrades the material. Silicon gaskets are probably unaffected. Not knowing which I have, I googled and learned that the tube of Lansinoh lanolin I almost threw out when I was cleaning out old stuff in the cabinets is perfect for lubing o-rings no matter which kind. Hope none of my fish are allergic to wool