if its an above ground pool i recommend you not take the filter cartridge system they usually include in the package and instead use a sand filter. also get a very small electric submersible pump that you can drop to the bottom of the pool that will circulate the water around the pool while the pump for the filter is running. just pull it out if anyone is going swimming. its very hard to keep above ground pools clear because the filter is only getting water from near the surface of the pool. the submersible pump takes care of that. also a detachable ladder is a must if there are children who are going to be at your house.