I dont run skimmers without float switches or optical sensors in the collection cup anymore.the felt ones i was using would clog within a week ...now i've switched to mesh...when they clogged the water level in that chamber would rise, and the level where the ato float is would drop, so salinity would go down as more water was added....skimmers are just one more thing to go wrong...cups can overflow and manage to get water on the floor even if they are in the sump, air inlets can clog etc....there's enough people out there that run tanks without either one so i figure mine can do without for a few weeks
skimmers can be set to run a more dry skim so they can still aerate the water like normal with less chances to fill up.
mesh socks are definitely a good alternative to felt for more time if not removing entirely.