The bearings on my motors seem to get very noisy after a few dives. I am trying to understand why they seem to fail so early. When I was first testing the ROV in my neighbors pool the motors seem to become very noisy a short time afterwards, so I thought they were just cheap bearings. I bought new bearings and replaced them all before going to Little Hawk Lake on my first open water dives. The bearings seem to hold up even after about 8-10 dives with no issues. When I came home and put the ROV back in my neighbors pool for the kids to play with I noticed a few days later that one motor developed very noisy bearings. I am now thinking the the chemicals used in their pool may be the cause of the bearings failure and I think Bromine is one of the chemicals used.Has anyone else had premature bearing failures and under what conditions? How have they help up in Salt water dives? I did use a Teflon spray on all the motors to repel the water.