My first filter lasted about one year with the pool under a large tree.
Since the pool had been remarcited and clouds of marble dust needed to be filtered,. The second filter lasted three months. The pressure rises to 20 lbs within a couple days and the returns are slow. The pool guys said the marcite would not clog the filter but I think otherwise. Even when cleanning the filter, the waste water now is not clouded. The pool water clear now. So I will again need to order a new filter. Happy with the first