The propellers usually do not wear out that fast, and they can last for years, but it all depends on the tank and if things are getting into the pump. If you have small snails, then it does not matter if the unit is brand new. If the snail goes into the propeller, there is a chance that the propeller will break. Propellers and bushings are considered wearable parts and are not covered by the warranty. If you want, create a private ticket, and we will do everything we can to help you this time.