We plan on purchasing an Intex 18'x52" Ultra Frame and using the Krystal Clear saltwater system, but I'm lost on what would be the best size pump and filter to use. It will come with a 1600 but I read that, while it will work, it's not quite adequate. I was looking at the Intex 2650 sand filter and pump, but is there something better out there that doesn't cost much more? I'm still trying to learn the basics so links would be helpful. 