How often to change filter in a quick set pool?

The manufacturer reccomends that you change it at least every two weeks and more frequently if you get a lot of grass, dirt or other contaminants in the pool or if there are a lot of people playing in the pool. Even if it is pretty clean and not many people use it you should change it every two weeks to keep the pump and filter working at optimum efficiency. It would be false economy to change them less frequently since it could wear out the pump prematurely or cause you to spend much more on chemicals to keep the pool balanced without proper and efficient filtering.