I have a intex 16x48 right now it is just running off the stock filter system. I have used intex sand filters in the past and they worked decent. I am looking at the intex 16" 3000gph model on amazon for 160 not a bad deal. Or would I be better off getting a better system. I do plan on maybe next year to upgrade to a metal framed pool. I've also thought about getting the intex 2500gph cartridge system to get by this year and decide if I'm going to go with a bigger metal frame next year.