I recently have a bearing break down. The bearing was gone and can't see anymore grease. I went to the nortern tool as suggested by the members here and replace both side of the hubs. The one side of the hub that is no broken, I noticed water in the bearing when i replace it. I wonder how water goes in and the seal seem ok. Some friend suggest it might cause by the type of grease I used. I use the marine grease i got from walmart, are those grease ok for use? or is that any good grease I should be using with the trailer bearing?